git-find-blob: actually (un)hexlify object ids
git-find-blob: add a few missing sha_unhex conversions
Revert "git-find-blob: actually (un)hexlify object ids"

This reverts commit 41f5cc4a0792ce12a442c2687ac88d14fff64792.

On second thought, this is pretty much useless anyway, 20 bytes vs 40.
git-find-blob: remove the noop sha_hex/sha_unhex completely

It turns out to have been a useless optimization.
git-find-blob: use a batch process for dereferencing all commits

Results in a significant performance gain as only one process per
search, not one per commit, has to be forked.
lib.py: Python 2 compatibility hacks
accdb: reindent (PEP8)
accdb: dump Qr codes for OATH TOTP
wmiirc: remove cg_migrate