src->enas

[ahundt]

This looks like an excellent paper and I'm about to try it out, thanks!

I found a small path naming scheme change from src->enas will make calling this source code easier if I try to utilize enas from other python code. Feel free to merge or close this as you prefer.

I was able to start up the macro search script after applying this change. While I did run into https://github.com/melodyguan/enas/issues/4, I'm sure that's not related to the directory name.