Revision 204

	* setup.py: Create a file in python's site-packages directory to
	make installation of Thuban as a library easier.
	(ThubanInstall.user_options): Add two new options,
	create-init-module and init-module-dir
	(ThubanInstall.expand_with_pure_python_dirs): New method to expand
	filenames for installation in the default directories.
	(ThubanInstall.select_scheme, ThubanInstall.convert_paths): Extend
	the inherited methods to capture some filenames before they're
	transformed too much by distutils.
	(ThubanInstall.run): Create the init module if requested.
	(ThubanInstall.thuban_init_filename): New method to return the
	full name of the init module.
	(ThubanInstall.get_outputs): Append the filename of the init
	module.