[Piuparts-devel] final batch for 0.77

[Andreas Beckmann]

remaining patches rebased:

ef494329a distros.conf: add wheezy-lts
06986fd07 extend some exceptions to dependent packages
1cdc6ff95 whitespace cleanup
652f9ef04 p.conf.anbe: [sid-bl] tune ignores and exceptions
d694d804b p.conf.anbe: tune precedence and debugging
8c2f1822f is_testable_uninstallable: skip distupgrades of ancient uninstallable packages
39386e07a is_testable_uninstallable: skip distupgrades of buggy ancient packages
44030d4cb p.conf: add changelog entries