[vim] Update bundles
[vim] Protect undo options
[git] Include automatic summary on merge
[vim] Update unimpaired
[git] Disable auto-correct

It scores lazy points, but on balance I prefer to see
random commands coming...
[git] Improve debt alias and keep merge backups
[sh] Change to 2013 texlive.

This really needs a proper fix
[sh] Add TEXMFHOME for local styles
[zsh] Refactor path_within_git_repo

Take advantage of some zsh features to make this shorter
[vim] Remove slimv bundle