Resolves request http://bugs.openfoam.org/view.php?id=2367

Patch contributed by Bruno Santos
Resolves bug-report http://bugs.openfoam.org/view.php?id=2312

- instead we use the CGAL settings directly since they have the
  same option of (version | system | none)

- may wish to review this again in the future.

- export/setenv WM_COMPILER_TYPE as suggested by Mattijs.

- for overall consistency, don't carp about an unset WM_COMPILER_TYPE,
  since this would only be on the first instance (prior to the
  export/setenv) and would be confusing about why/when this message
  may occur.

- reduce clutter: only use (system|ThirdParty) for WM_COMPILER_TYPE.
  Drop the old 'OpenFOAM' setting for WM_COMPILER_TYPE, which was
  transitional in early 2011.

- make the error messages more meaningful

- also update settings to include newer compiler versions

Patch contributed by Bruno Santos
Resolves patch request http://bugs.openfoam.org/view.php?id=2112

FOAM_INST_DIR is the location of the OpenFOAM installation which defaults to
the directory containing the etc/bashrc,cshrc file.  If this default is
not appropriate FOAM_INST_DIR can be set explicitly.

Additionally filter $ParaView_DIR from paths in config.sh/paraview and config.csh/paraview

Resolves bug-report http://bugs.openfoam.org/view.php?id=2031

Set the environment variable "FOAMY_HEX_MESH" to build foamyHexMesh,
e.g. in ~/.OpenFOAM/dev/prefs.sh

FOAMY_HEX_MESH=yes

for consistency with etc/bashrc and etc/config.sh

See commit 4409a0ea

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

Provided by Bruno Santos
Also some general cleaning and update of comment.
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1167

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.

Change default version to 4.1.0 (may need to revert to 4.0.1 after
further testing of 4.1.0)

The default ParaView is now 4.0.1 pending completion of testing of 4.1.0