subrepo: only attempt pulling from git's origin git fetch does not accept repository URLs as arguments, and the intended logic of this code was not actually doing anything.

subrepo: disallow all unknown git ref types

sshrepo: catch passwords in ssh urls see also e4b02eb825b1

hgk: display bookmark in commit diff window

hgk: display bookmarks as gray labels in the commitline

hgk: read bookmarks

subrepo: expand relative sources for git subrepos

changegroup: fix typo introduced in 9f2c407caf34