updates for mercurial

updates for mercurial

Changed the templates file to not hardcode 'git', and manually unfuzzied
all translations except for Vietnamese, which stumped me. A few
translations _may_ read incorrectly when VCS=hg, most should be ok.

Updated git-specific documentation, but left the tutorial git-specific.

Rename more conffiles. Joy oh, joy.

Update dependencies.

Add some more documentation about etckeeper.conf.