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

etc/config/paraview.*: Update include directory name which is 3.0 rather than 4.0 even for ParaView-4

Note that in order to build and install ParaView-4.3.1 lines 653-656
must be removed or commented from file

ThirdParty-dev/ParaView-4.3.1/Qt/Components/CMakeLists.txt

after unpacking the ParaView-4.3.1 source-pack from KitWare.  This is
because the file ui_pqExportStateWizard.h referred to in the lines
653-656:

if(PARAVIEW_INSTALL_DEVELOPMENT_FILES)
  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/ui_pqExportStateWizard.h"
          DESTINATION "${VTK_INSTALL_INCLUDE_DIR}")
endif()

does not exist and cannot be installed causing the build and
installation to fail.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1201

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

- use standard *.sh, *.csh endings

This reverts commit c5bea524.

- this change was wished by Mattijs and/or Henry

- allow command-line settings to retain the flexibility of 'foamPV'
  alias mechanism.

This reverts commit 2e1e671d.

- drop FOAM_MPI_LIBBIN variable in favour of FOAM_MPI from which
  two different locations can be determined.

  Previously there was something like this:

      FOAM_MPI_LIBBIN = $FOAM_LIBBIN/openmpi-1.5.1

  We now instead determine the locations from the FOAM_MPI directly:

      FOAM_MPI=openmpi-1.5.1

          $FOAM_LIBBIN/$FOAM_MPI     -> OpenFOAM  mpi-related
          $FOAM_EXT_LIBBIN/$FOAM_MPI -> ThirdPary mpi-related

ENH: relocate ParaView libraries and plugins back under FOAM_LIBBIN

- as discussed with Mattijs

- remove settings for really old cmake versions

- avoid non-standard 'tempfile' in bin/tools/foamConfigurePaths

non-numeric (eg, a git or cvs version).

- place the onus on the user to provide the correct ParaView_MAJOR in
  these situations.

STYLE: Drop support for cmake older than 2.6.4 (installed in 3rdParty)

We should assume that they've been compiled with the current OpenFOAM
compiler settings and may have compiler-specific runtime requirements.

old: $WM_THIRD_PARTY_DIR/<packageName>/platforms/$WM_ARCH*
new: $WM_THIRD_PARTY_DIR/platforms/$WM_ARCH*/<packageName>

This streamlines the creation of binary packs, eases distribution and
helps when testing the robustness of relocatable installations.