* man/generate_translations.mak, man/generate_mans.mak,

	* man/generate_translations.mak, man/generate_mans.mak,
	po/Makefile.in.in: Removing and restoring the config.xml file
	broke parallel builds. Build the manpages based on *.xml-config
	files instead of *.xml files.  The *.xml do not include config.xml
	anymore, which permits to run xml2po without needing to remove
	config.xml. The config.xml is restored in the *.xml-config files.
	* man/groupadd.8.xml: Implementation of the above.
	* man/generate_mans.deps: Updated dependencies