README, default HTTP::Server::Simple config
Bugzilla::Constants code style
Change sql_interval to sql_date_math, like in upstream

(mozilla bug #602165, upstream commit 220a5e6608eb8de2253311fbd978498ee4f4622f)
Fix incorrectly removed user_group_map.user_id field

(follow-up to 96b0e9eed552f416fc9425508147c145c5052a48)
Fix initial population of fielddefs table
Fix some more DB initialisation errors
Fix 0 visibility_value treating
Fix bug form for the case when there are less than 4 custom fields