nixpkgs-lint: Fix priority check
Fix some name collisions
webkitSVN: Remove

It hasn't been updated in a long time.
Fix a name collision between glibc and glibc217
Fix a name collision between two distinct KDE wallpaper packages
linux: Update to 3.2.49, 3.4.55
batman-adv: Disambiguate kernel versions
Make phpXdebug_5_3 low priority
nixpkgs-lint: Warn against capitalised package names and missing versions