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.
requesting all changes
abort: error: Connection refused
255
ls: copy: No such file or directory
requesting all changes
abort: HTTP Error 404: File not found
255