[docs] Reordered some doc parts
[docs] Started migrating the doc to sphinx
[docs] Fixed Makefile documentation target
[docs] Merge the last documentation updates
Merge branch '2.5' into 2.5-sphinx-docs

Conflicts:
	QUICKSTART-USER
	docs-old/documentation/FAQ-ADMIN
Merge branch '2.5-sphinx-docs' of git+ssh://scm.gforge.inria.fr/gitroot/oar/oar into 2.5-sphinx-docs
[docs] migrate documentation to sphinx
[tools] fix typo in oar_resources_add
[qfonctions] oarnotify -> get old buggy option names back for backward compatibility
[iolib] fix mysql bugs

Some PostgrSQL statements are not compataible with MySQL.
[api tests] Set user from ENV