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- document special steps for using ThirdParty mpfr/gmp with clang etc

ENH: add support of additional configure options to some make scripts

- remove hard-coded --verbs from makeOPENMPI in favour of letting the
  user provide it via the command-line for makeOPENMPI.

  eg,  makeOPENMPI openmpi-1.10.6 -- --with-verbs=DIRECTORY ...

- 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

- 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

- this is the upcoming default Qt version

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

- obtain version by sourcing the coresponding OpenFOAM config file

STYLE: update build documents

- remove extra scotch readme, already mentioned in regular
  BUILD/README files

- additional sources.txt to note which versions have been shipped.

- initial attempt for building CGAL as headers-only, and without
  gmp/mpfr

- this makes the README.md easier to read at a glance

- include comments about building Qt etc.

- include comments about building Qt etc.