Bug 552858: versioning

Bug 552858: versioning

	This is a big patch.  You should probably remove your installation
	tree to be cleaner.

	* docs/typelib-format.txt: Add nsversion entry which holds
	version of namespace.
	* girepository/girepository.h: Add 'version' parameter to
	g_irepository_require.  This may be NULL.  Normally
	bindings should pass an explicit version though.
	* girepository/girepository.c: Lots of infrastructure to
	support versioning.  Add some more documentation.  Disallow
	some usage of NULL namespaces.
	* girepository/girmodule.c: Add version parameter.
	* girepository/gtypelib.c: Update header size.
	* giscanner/ast.py: Add version to Namespace.
	* giscanner/girparser.py: Parse version attribute from
	XML, pass to Namespace.
	* giscanner/girwriter.py: Write out version parameter.
	* giscanner/transformer.py: Clean up include registration.
	* tests/*: Add version attribute.
	* tests/invoke/invoke.c: Don't try looking up test before
	it's loaded in repository.
	* tools/generate.c: Output version parameter.
	* gir/Makefile.am: Add 2.0 version to .gir files.

svn path=/trunk/; revision=677