test-rebase-parameters: more tests for revset/opts - --source and revset - --base and revset - --rev and revset - --rev and --source combination - --rev and --base combination

help/config: expand [subpaths] help Brifly explain why rewriting subrepository paths can be necessary. Explain that relative subrepository paths are made absolute before rewrite rules are applied.

doc: update copyright years to 2012 I sometimes look at a piece of software and if the man page says "Copyright 2004", then I'm inclined to think that the project is stale or that the authors are lazy. Neither is good publicity for us :-)