bookmarks: consider successor changesets when moving bookmark (issue4015) Previously, this required -f because we didn't consider obsolete changesets (and their children ... or successors of those children, etc.). We now use obsolete.foreground to calculate acceptable changesets when advancing the bookmark. Test coverage has been added.

util: url keeps backslash in paths Backslashes (\) in paths were encoded to %C5 when converting from url to string. This does not look nice for windows paths. And it introduces many problems when running tests on windows.