Gogui: regular gtp engine, dcnn rotations

[lemonsqueeze]

Hi, I came up with this to play with GoCNN in gogui: I couldn't get main.py to run initially so had to work around the package issues with limited python knowledge. Not sure what's the proper way to do it, at least this works for me.

For the gogui part i found it easier to have the engine behave as a regular gtp engine, following gogui's play commands. This way you can use gogui to navigate the sgf or try variations. Code is simpler too, the engine doesn't have to deal with sgf files.

I added commands to try different dcnn rotations, interesting to see how it changes its mind completely on some groups from one rotation to another when it's not clear about life and death. This one is a good example.

Interesting project, thanks !