- adjust mesa, vtk versions to the latest

- as per bashrc,cshrc delimit with
      "# USER EDITABLE PART"
      "# END OF (NORMAL) USER EDITABLE PART"

  this can help simplify any patching for system-building scripts etc.

- fixed library path for VTK.
  They should use lib/ and not lib64/

- sometimes used for off-screen rendering.
  Only add to library-path when they are actually available

* boost 1_62_0 (Sept 2016)

* CGAL 4.9 (Sept 2016)
  - now has headers-only mode that could be interesting

* FFTW 3.3.5 (Jul 2016)

* openmpi 1.10.4 (Sept 2016)
  - the first openmpi 2.x release is also available, but too early to switch

* paraview 5.2.0 (Nov 2016)
  - builds without additional patching

STYLE: removed unneeded CMake environment variables

- many systems may not have boost or FFTW installed, or in an older
  version. Using ThirdParty for them should lead to a more robust
  build process.

- replace with an alternative workaround.

  Unset the _foamAddLib function prior to sourcing config.sh/CGAL:

  - LD_LIBRARY_PATH will not be adjusted.
  - cgal_version/boost_version variables will be retained.

Note: for ThirdParty builds, it is important that the boost and CGAL
paths are added into LD_LIBRARY_PATH even if before they are created.
This ensures that the OpenFOAM environment is functional after the
build.

The '*-none' and '*-system' specifications can still be used to avoid
setting them at all.

- also update settings to include newer compiler versions

Patch contributed by Bruno Santos
Resolves text report http://bugs.openfoam.org/view.php?id=2089

etc/config.sh and etc/config.csh

This structure is more convenient to add support for other shells, e.g. zsh, fish etc.

Resolves feature request to simplify support for other shells in
http://www.openfoam.org/mantisbt/view.php?id=1232

To compile with 64bit labels set

WM_LABEL_SIZE=64

in ~/OpenFOAM/dev/prefs.sh

source ~/.bashrc

then Allwmake in OpenFOAM-dev.

This will build into for example OpenFOAM-dev/platforms/linux64ClangDPInt64Opt

If WM_LABEL_SIZE is unset or set to 32:

WM_LABEL_SIZE=32

the build would be placed into OpenFOAM-dev/platforms/linux64ClangDPInt32Opt

Thus both 32bit and 64bit label builds can coexist without problem.

- use standard *.sh, *.csh endings

This reverts commit c5bea524.

This reverts commit 2e1e671d.

- the path is accesible either way, but use setenv for consistency with
  other environment variables. It also simplifies foamCleanPath again.

ENH: upgrade to env. variable to ensight9 (current version)

- get version from $ParaView_VERSION or from -version option
- added QT gui support (useful when compiling enGrid)
- update files for finding cmake-2.6.4 as well
- added bin/engridFoam for calling a version of enGrid that uses the
  paraview libraries compiled with/for OpenFOAM
- added foam3rdParty change directory alias

  * prefix internal functions with _foam to prevent collisions
  * cleanup functions after use
  * centralized FOAM_VERBOSE info to etc/{bashrc,cshrc}