aur_updates: Headings
aur_updates: Work around new package naming scheme

With pacman 4.1, a lot of -git packages have a different version naming
scheme (including my own) as not all maintainers chose to bump the
epoch. For the time being, this commit allows me to see all packages
with a *different* version in the AUR -- even if they're older.

I'll revert this commit in a couple of weeks when all machines and
packages are updated.
my-gitk: Bump to current upstream gitk