Can now use ocl simulator with new nengo version
Improved plotting when using new nengo.

Lines for correcting population/vector are displayed using a different
linestyle.
Made seeding work.

Can't use vector-seed and test-seed separately at the moment, but at
leaast its deterministic.
Better seeding.
Small fixes.

* Better probing.

* Better plotting.
Fixed seeding again.

Now 3 phases instead of just 2.

Phases are corpus, model, and test, can specify separate seed for
each of them.
Improved plotting.