Use inqbuild2 in DefaultTopicList.Tick.
Avoid doing a full paginator calculation in the topic list when the result is obvious.
Add defaultPagi and setForumList methods to DefaultTopicList.
Cache two more items in qcache.
Use a string builder in inqbuild and inqbuildstr.
Add the inqbuild2 function.
Reduce boilerplate in topic.go