Add platform detection.

Additional changes to documentation build procedure

This commit was generated by cvs2git to create branch 'V7_main'.

Cherrypick from master 2013-11-08 12:37:45 UTC rnv <rnv@opencascade.com> 'Implementation of the impruvement 0022256: [CEA 866] Add item "Developers" in menu "Help".':
    CMakeLists.txt
    CMakeModules/FindGraphviz.cmake
    CMakeModules/FindSalomeDoxygen.cmake
    CMakeModules/FindSalomeGraphviz.cmake
    CMakeModules/FindSalomeSphinx.cmake
    CMakeModules/FindSphinx.cmake
    CMakeModules/SalomeDocumentationMacros.cmake
    CMakeModules/SalomeMacros.cmake
    dev/CMakeLists.txt
    dev/cmake/CMakeLists.txt
    dev/cmake/source/config.rst
    dev/cmake/source/pkg.rst
    dev/cmake/source/skeleton.rst
    dev/cmake/source/various.rst
    dev/git/CMakeLists.txt
    dev/git/Git_Simple_Write_Procedure.rst
    dev/git/Switch-To-GIT-2013-06.docx
    dev/git/conf.py
    extra/CMakeLists.txt
    gui/CMakeLists.txt
    tui/CMakeLists.txt

Merge from trunk (6x) 01/08/2013

This commit was generated by cvs2git to create branch 'V7_main'.

Sprout from master 2012-11-27 06:02:38 UTC vsr <vsr@opencascade.com> 'Update documentation for SALOME 6.6.0'
Cherrypick from master 2013-07-11 11:16:55 UTC bruneton <bruneton> 'CMake: finished doc':
    dev/cmake/source/conf.py
    dev/cmake/source/index.rst
    dev/cmake/source/intro.rst

Update documentation for SALOME 6.6.0

typo

fix typo

fix accentuated character

add new files

reorganize DOCUMENTATION directory

Update Mesh plugins integration document (issue 21531)

initial creation of CVS repository