hooks: add url to changegroup, incoming, prechangegroup, pretxnchangegroup hooks
all repository classes now have url() method that returns url of repo.
(the addremove command is deprecated; use add and remove --after instead)
adding dir/bar
adding foo
dir/bar
foo
(the addremove command is deprecated; use add and remove --after instead)
adding dir/bar_2
adding foo_2
dir/bar_2
foo_2