- only addresses -mesa-prefix behaviour.
  The -mesa-lib option makes no assumptions at all.

STYLE: update versions in makeParaView.example, makeVTK.example

- this is the same version as OpenFOAM-1612 shipped with and seems to
  have fewer issues than the newer openmpi-2.1.1

- follow the standard *_ARCH_PATH style

- similar functionality in etc/tools/ThirdPartyFunctions to improve
  the independence of ThirdParty while reducing clutter in the callers.

- add useGcc function for convenience
- mask seeing our own git-repo when building

STYLE: various items

- eliminate old user-editable configuration in files - now command-line only.
- use *_BUILD_DIR instead of *_BINARY_DIR for more clarity of the purpose
- drop use of '-q' option for wmakeCheckPwd (already has stderr redirect)
- drop checkVersion for makeParaView since it stopped working properly
  with newer paraview version

CONFIG: update list of versions

- not necessarily supported by OpenFOAM, but at least the build script
  works again, and the build is now out-of-source.

- this creates a cmake-system link to the given cmake version, which
  is a simple means of providing an updated cmake version for the
  OpenFOAM build without actually needing to edit the
  etc/config.sh/paraview file

ENH: avoid editing pkgconfig symlinks

- OpenFOAM doesn't use any of the CGAL image library and the ImageIO
  library adds in an unnecessary OpenGL dependency (reported to fail
  on kubuntu-14.04)

STYLE: adjust documented link to main (non-svn) VisIt project directory

- makes is easier to quickly build different versions and reduces
  clutter in Allwmake.

- provide some quick '-test' options for makeCGAL, makeFFTW etc
  to reduce duplication of logic in Allwmake.

- simplifies relocation at a later stage

- both can operate on several directories, which means that the
  following is possible when relocating an entire third-party
  directory:

     etc/pkgconfigPrefix $(find platforms -type d -name pkgconfig)

- now handles both lib/pkgconfig and lib64/pkgconfig locations
- also adjust includedir= and libdir= entries

- unify cd, check for the cwd and error message

- simple means of distinguishing between types of builds
  (mesa, mpi, python).

- allows reuse for other packages using pkgconf

- reference: https://gitlab.kitware.com/vtk/vtk/merge_requests/1642

- this is the upcoming default Qt version

- fftw uses the double-precision interface only and thus
  makeFFTW should not have any special single-precision treatment.

- Bug is not apparent if the fftw was previously build with
  double-precision.

Last-minute fix for typos

See merge request !3

Update master prior to v1612 release

See merge request !2

- corresponds to the system clang for opensuse leap 42.1, which has
  been used extensively during the development process.

- also avoid issues with '+' being treated as a list separator
  (already patched in 5.2)

--
STYLE: reformat version check output (in makeParaView)

- allows the user to inspect what has been patched.
- also use fuzzy patching (ignore whitespace) for a bit more robustness

- obtain version by sourcing the coresponding OpenFOAM config file

STYLE: update build documents