- slightly odd. Building CGAL on other Linux systems have a proper
  ldd dependency for gmp/mpfr, but ubuntu doesn't

- if set in a dictionary and later removed, the intermediate value is
  retained rather than reverting to a normal default value.

- same applies for a few other function objects and their variables

- the interval for the next restart was not being adjusted when the
  file was reread, or when doing a complete simulation restart.

- propagate updated objectRegistry methods (eg, lookupObjectRef etc)
  into regionFunctionObject

ENH: improve objectRegistry functionality (issue #322)

- Recursive searching for objects within a registry is now optional
  (previous it was always done).

  A recursive search effectively blocks the construction of sub-sub-registries
  if their names are 'masked' by some parent level sub-registry with
  the same name! (BUG)

- Recursive search is now turned OFF by default, which makes it consistent
  with dictionary and probably causes the least number of surprises.

----
Various new convenience methods added:

lookupObjectRef()
- returns a non-const reference.
  For example,

      volScalarField& U = mesh().lookupObjectRef<volScalarField>("U");

  Instead of

      volScalarField& U = const_cast<volScalarField&>
      (
          mesh().lookupObject<volScalarField>("U")
      );

--
lookupObjectPtr()
- returns a const pointer, and nullptr on failure.
  For example,

      const volScalarField* Uptr = mesh().lookupObjectPtr<volScalarField>("U");
      if (Uptr)
      {
          const volScalarField& U = *Uptr;
          ...
      }

  Instead of

      if (mesh().foundObject<volScalarField>("U"))
      {
          const volScalarField& U = mesh().lookupObject<volScalarField>("U");
          ...
      }

--
lookupObjectRefPtr()
- returns a non-const pointer, and nullptr on failure.
  For example,

      volScalarField* Uptr = mesh().lookupObjectRefPtr<volScalarField>("U");
      if (Uptr)
      {
          volScalarField& U = *Uptr;  // use as reference
          (*Uptr) = ...;              // or use directly
      }

  Instead of

      if (mesh().foundObject<volScalarField>("U"))
      {
          volScalarField& U = const_cast<volScalarField&>
          (
              mesh().lookupObject<volScalarField>("U")
          );
      }

--
sortedNames()
- now works with template parameters and with regular expression
  matching as well.
  For example,

      wordList names  = mesh().sortedNames();
      wordList fields = mesh().sortedName<volScalarField>();

  Instead of

      wordList names  = mesh().sortedNames();
      wordList fields = mesh().names<volScalarField>();
      Foam::sort(fields);

--

See merge request !83

runTimePostProcessing FO camera update

- Removed the camera 'mode'
    - The (old) static camera was only appropriate when parallel
      projection was inactive, and the view was centred at (0 0 0)
    - Camera input now always requires 'position' and 'focalPoint'
    - Clip box is now optional.  Note that this is applied after the
      camera
      set-up and so will override the camera position
    - View angle is only appropriate when not using parallel projection
    - Zoom now required, applied after all other operations
      - 1 = do nothing, >1 = zoom in, <1 = zoom out

    Example input:

```
        camera
        {
            // Total number of frames to generate
            nFrameTotal 1;

            // Parallel projection flag
            parallelProjection no;

            focalPoint  (0 0 0);
            up          (0 1 0);
            position    (0 0 1);

            // Optional entries
            clipBox     (-0.0206 -0.0254 -0.0005) (0.29 0.0254 0.0005);
            viewAngle   20;
            zoom        1.1;
        }
```

See merge request !81

Conflicts:
	src/TurbulenceModels/compressible/turbulentFluidThermoModels/derivedFvPatchFields/outletMappedUniformInletHeatAddition/outletMappedUniformInletHeatAdditionFvPatchField.H

- provide additional filtering methods on names(), sortedNames()
  For example,

      IOobjectList objects = ...;
      wordReList selection = ...;

      objects.sortedNames(VolFieldType::typeName, selection);

- Recursive searching for objects within a registry is now optional
  (previous it was always done).

  A recursive search effectively blocks the construction of sub-sub-registries
  if their names are 'masked' by some parent level sub-registry with
  the same name! (BUG)

- Recursive search is now turned OFF by default, which makes it consistent
  with dictionary and probably causes the least number of surprises.

----
Various new convenience methods added:

lookupObjectRef()
- returns a non-const reference.
  For example,

      volScalarField& U = mesh().lookupObjectRef<volScalarField>("U");

  Instead of

      volScalarField& U = const_cast<volScalarField&>
      (
          mesh().lookupObject<volScalarField>("U")
      );

--
lookupObjectPtr()
- returns a const pointer, and nullptr on failure.
  For example,

      const volScalarField* Uptr = mesh().lookupObjectPtr<volScalarField>("U");
      if (Uptr)
      {
          const volScalarField& U = *Uptr;
          ...
      }

  Instead of

      if (mesh().foundObject<volScalarField>("U"))
      {
          const volScalarField& U = mesh().lookupObject<volScalarField>("U");
          ...
      }

--
lookupObjectRefPtr()
- returns a non-const pointer, and nullptr on failure.
  For example,

      volScalarField* Uptr = mesh().lookupObjectRefPtr<volScalarField>("U");
      if (Uptr)
      {
          volScalarField& U = *Uptr;  // use as reference
          (*Uptr) = ...;              // or use directly
      }

  Instead of

      if (mesh().foundObject<volScalarField>("U"))
      {
          volScalarField& U = const_cast<volScalarField&>
          (
              mesh().lookupObject<volScalarField>("U")
          );
      }

--
sortedNames()
- now works with template parameters and with regular expression
  matching as well.
  For example,

      wordList names  = mesh().sortedNames();
      wordList fields = mesh().sortedName<volScalarField>();

  Instead of

      wordList names  = mesh().sortedNames();
      wordList fields = mesh().names<volScalarField>();
      Foam::sort(fields);

--

- test clearly shows failure to insert a sub-registry when it has
  the same name as one of the parent sub-registry.

- the user might otherwise be unaware of the changed location

- both are typedefs for UList<label>

- was using direct face ids instead of appropriate sub-lists
- also removed typo that wasn't helping much either

- remove remnant nullptr check

- vtkkwiml headers use old-style casts, so reduce compile-time warnings

- newer versions of paraview build fine, and so do the reader modules,
  but the reader modules won't load (need to upgrade the classes).

- now that adios_config flags are largely working in ThirdParty

STYLE: only use paraview settings when actually available

- this means executing makeParaView prior to building OpenFOAM itself,
  but is consistent with the instructions given by makeParaView,
  and elminates anticipating the source location from the paraview
  config file, which increases the build flexibilty for ThirdParty

    - Removed the camera 'mode'
    - The (old) static camera was only appropriate when parallel
      projection was inactive, and the view was centred at (0 0 0)
    - Camera input now always requires 'position' and 'focalPoint'
    - Clip box is now optional.  Note that this is applied after the
      camera
      set-up and so will override the camera position
    - View angle is only appropriate when not using parallel projection
    - Zoom now required, applied after all other operations
      - 1 = do nothing, >1 = zoom in, <1 = zoom out

    Example input:

        camera
        {
            // Total number of frames to generate
            nFrameTotal 1;

            // Parallel projection flag
            parallelProjection no;

            // Optional clippling box
            clipBox     (-0.0206 -0.0254 -0.0005) (0.29 0.0254 0.0005);
            focalPoint  (0 0 0);
            up          (0 1 0);
            position    (0 0 1);
            viewAngle   20;
            zoom        1.1;
        }