Restore information that were lost from QUICK-START.txt.
Restore information that were lost from QUICK-START.txt.

	* doc/installation/installation.tex: Document installation on windows
	and hint the user to set his PATH.

urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi