FEATURE: context is not emailed if we previously emailed you the post
FEATURE: site setting to enable_watch_new_topics , false by default.
When enables users can elect to watch everything by default
FIX: Custom email subjects (x quoted you in [title], x replied to [title])
was removed, this broke email grouping. TBD, include info in footer somehow
FIX: topic user specs were messy, reduce side effects
When accessed over IPv6, the ip address of the user is a 128-bit number,
too big for PostgreSQL's bigint data type. Since PostgresSQL has the
built-in inet type, which handles both IPv4 and IPv6 addresses, we
should use that instead. Where this is done elsewhere in the codebase,
the column is called ip_address, so we should follow that convention as
well.
This migration uses a SQL command to populate the new field from the old
one, so as not to rely on the TopicLinkClick model class, which should
keep the migration from failing if that class is modified in the future.
