Slight speed improvement because hardware is flexible enough.
Add parallel hline pcores. Works with a nice speedup (~4.8us to ~2.8mus).
Get rid of infinite loop hanging, and narrowed it down to hline_pcore hanging. Software is able to detect a hang, so it should just need to reset the hline_pcore on a hang.
Merge branch 'master' of github.com:molohov/gpu2