[StGIT PATCH 00/10] Various fixes and improvements

I found a couple of issues involving stack deletion, here are fixes for the most annoying ones. Also includes some small cleanups involving parent information, as well as mostly-unrelated small improvements gathered while hacking on the other patches.

Note: since I have seen the patch entitled 'git-fetch: Support the
local remote "."', I'm much less sure about my patch that stops
recording this type of information (the "Stop recording
branch.*.remote to '.' for local parents." one), but I add it
nevertheless, mostly for discussion.