sup component: indexing

All issues

	2008-05-25	attachment name searchability	0.6
	2008-05-01	all ferret access needs to be wrapped in a mutex
	2008-04-29	thread joining doesn't always work
	2008-04-25	killed threads showing up in inbox-mode
	2008-03-14	thread joining is not preserved when reindexing
	2008-03-14	oldest-first thread ordering
	2008-03-07	spurious messages appearing in inbox	0.5
	2008-03-07	long message ids (>255 characters) never get matched by ferret	0.5
	2008-03-07	query normalization breaking disjunctive queries, date modifers, etc	0.5
	2008-03-07	index speedup	0.5