Clean up date and timezone handling.
We used to pass changelog dates around as a "unixtime timezone" string
containing a pair of encoded ints. Now, they get passed around as a
(unixtime, timezone) tuple of numbers, which makes much more sense.
removing b
this update spans a branch affecting the following files:
b
aborting update spanning branches!
(use update -m to merge across branches or -C to lose changes)