Lintian 2.2.11

It had been about a month and a half since a Lintian upload, so we of course had accumulated a ton of fixes that no one was yet benefitting from. I probably should have done a release a while back.

The changes in this release are mostly lots of little things that most people aren't likely to notice unless they had run into the specific problem that was fixed. Lintian now uses libapt-pkg-perl to do version number comparisons instead of forking a copy of dpkg, which I hope will be a lot faster and consume less memory (due to the version comparison cache we no longer need) on archive-wide runs.

Thanks to Adam D. Barratt, who did the lion's share of the work for this release.