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- assignment operators return a value, for consistency with bool.

- partial revert of DEFAULT_TRUE, DEFAULT_FALSE, to reduce complexity.

Eg,
    #define FOAM_CONFIGURED_PROJECT_ETC "/usr/share/openfoam/etc"

This provides some easy to file patching locations, but is not yet
integrated in the build system at all.

- in some circumstances we need to pass a bool value upwards to the
  caller and know if the true/false value was set based on real input
  or is a default value.

  Eg, in the object::read() we might normally have

     enabled_(dict.readIfPresent(key, true));

  but would lose information about why the value is true/false.

  We can change that by using

     enabled_(dict.readIfPresent<Switch>(key, Switch::DEFAULT_ON));

  After which we can use this information is testing.

      if
      (
          child.enabled().nonDefault()
        ? child.enabled()
        : parent.enabled()
      )
      { ... }

   And thus enable output if the parent requested it explicitly or by
   default and it has not been explicitly disabled in the child.

  No difference when testing as a bool and the text representation
  of DEFAULT_ON / DEFAULT_OFF will simply be "true" / "false".

ENH: add construction of Switch from dictionary (similar to Enum)

- avoids removal of files and the dummy fallback

- as well as being more convenient to find, this is necessary when the
  OpenFOAM installation is without sources or tutorials

- Can result in inadvertent conversions where the user should really
  know or check if the pointer is valid prior to using.

- Still have several places to fix that are using the deprecated copy
  construct and copy assignment

- workaround for some old compilers many years ago, but no longer relevant

- in the previous version, a specification such as (U "U.*")
  would have selected the field name twice for writing

- can also be used for other purposes.
  Eg,

      if (ListOps::found(list, matcher))
      {
         ...
      }

  vs.

      if (!findStrings(matcher, list).empty())
      {
         ...
      }

- add compile-time detection of deprecated findIndex() function

- replace occurrences of findIndex() with the equivalent container
  method

- simply a functionObject with an additional Time reference, which is
  a combination frequently used by concrete functionObjects

- use for-range when iterating
- dictionary access/search methods
- autoPtr for memory management

- changed the sectorCoeffs keyword to 'point' from 'axisPt'
  for more similarity with other dictionaries.
  Continue to accept 'axisPt' for compatibility.

- allows use in surfMesh library, which does not depend on meshTools

- checkIn() was incorrectly conditional on the register state of the
  source object.

Partial patch from .org commit 6dc48b62d948

- now free anything owned by the registry when doing a clear.

- the myriad of other ways to remove items (and potentially leaking)
  have not yet been addressed:
  * set, erase, retain, filterKeys, filterValues, filterEntries

- could be triggered if running in parallel, but requesting procIDs
  to be written with a non-parallel version of the writer.

- Uses the user-specified value for the HTC calculation

  {
      type  externalCoupledTemperature;

      outputTemperture    fluid;  // or wall;
      htcRefTemperature   user;   // or cell (default)

      Tref    293.15;
  }