Instead of using separate Commune and Think goals depending on
whether we're querying for or setting thoughts we now instead solely use
the Think op. This op wraps another op, which is then used to determine
what to do. The ops that are supported are: Set, Get, Delete and Look
Think(Set): sets new thoughts and updates existing ones, if an id is
supplied.
Think(Get): get all or specific thoughts (replaces Commune)
Think(Look): inspects a specific goal
Think(Delete): deletes all or a specific thoughts (i.e. both goals and
knowledge)
