Make "hg incoming -r revision_number" work for remote repos (issue566) Uses the remote repository's lookup method as pull does and only transfers what is needed to calculate incoming changesets. One minor problem: As only the needed changesets are transfered and stored in a local bundle repository, the tip tag of this bundle is shows despite not being the tip changeset of the remote repository. (see "+tag: tip" in tests/test-incoming-outgoing.out in this patch)

--- a/tests/test-incoming-outgoing.out
+++ b/tests/test-incoming-outgoing.out
@@ -71,6 +71,7 @@ date:        Mon Jan 12 13:46:40 1970 +0
 summary:     3
 
 changeset:   4:1f3a964b6022
+tag:         tip
 user:        test
 date:        Mon Jan 12 13:46:40 1970 +0000
 summary:     4