util: use built-in set and frozenset This drops Python 2.3 compatibility.

Merge with crew-stable

convert/bzr: fix symlink handling (issue1626)

win32text: be more careful about rejecting violating changesets We now try to walk changesets in reverse order from newest to oldest, so that if we see a file multiple times, we treat the newest version as canonical. This should prevent us from rejecting a changegroup that contains an unacceptable commit followed later by a commit that fixes the problem.

keepalive: attempt to fix issue1003 This is a reimport of the relevant piece of the upstream urlgrabber, which appears to be more correct.

test-archive: silence stupid messages from GNU tar Recent versions of GNU tar have apparently decided they're old enough that it's ok for them to prattle on senselessly about things no one cares about without anyone objecting. We object; apply duct tape.

ui: introduce new config parser

ui: simplify init, kill dupconfig

ui: fold readsections into readconfig readconfig now reads only single files readconfig takes an optional list of sections readconfig trusts files we're looking for sections in

ui: cleanup _is_trusted a bit