aliases should be restructured

[m4v]

In stormyfacts I'm using the same aliases of Encyclopedia, using "<alias>factoid" for mark an alias.
This is good enough when you have to find the factoid of an alias, but is a hassle if you want to do find the aliases of a factoid, and in stormyfacts is aggravated by the use of revisions, specifically you have to:

aliases = store.find(Fact.name, Not(BitwiseAnd(Fact.flags, flags.DELETED)),
                                Fact.id == Revision.fact_id,
                                Fact.rev_id == Revision.rev_id,
                                Revision.value.like("<alias>%s" % name))

And is slow, is noticeable only in the cgi page though. I'm thinking in adding a separate table for aliases.

[m4v (m4v)]

Raising priority, due to database changes I need to figure this out before the plugin switch.

For now, in my local branch page loading improves 3 times and code is less a hassle, but the branch is incomplete and most testcases fail.