Slow unit tests

[Bron Gondwana]

I've noticed a bit of a creep in the cunit tests - they've gone from taking a few seconds to taking significantly longer.  We need to keep them fast, or running them becomes a pain rather than something you do all the time.

I'd like to maybe do a "light-tests" and "heavy-tests" if we're going to do things which are timing or massive data dependent in our unit tests.

Bron.

-- 
  Bron Gondwana
  brong at fastmail.fm