Merge branch 'fc/remote-hg'

* fc/remote-hg: (50 commits) remote-hg: add support for --force remote-hg: add support for --dry-run remote-hg: check if a fetch is needed remote-hg: trivial cleanup remote-helpers: improve marks usage remote-hg: add check_push() helper remote-hg: add setup_big_push() helper remote-hg: remove files before modifications remote-hg: improve lightweight tag author remote-hg: use remote 'default' not local one remote-hg: improve branch listing remote-hg: simplify branch_tip() remote-hg: check diverged bookmarks remote-hg: pass around revision refs remote-hg: implement custom checkheads() remote-hg: implement custom push() remote-hg: only update necessary revisions remote-hg: force remote bookmark push selectively remote-hg: reorganize bookmark handling remote-hg: add test for failed double push ...