* configure.in: Bump the version number to 2.3.0

	* configure.in, Makefile.am, macros2/autogen.sh, doc-build/*:
	Add in the infrastructure to allow user documentatin to be built
	from some common files. This will not affect existing packages.
	The changes required to use this are given in doc-build/README.

svn path=/trunk/; revision=2905