I added it 8 hours ago because my image crashed and I had to save at least something using "eval" from terminal. Then went sleep :)

Basically I made some checks to determinate if it would make sense to use opengl instead of Cairo. Because Cairo is slow on huge simulations and performs a little bit worse then morphic.

I will remove it ASAP. Please, only read and document stuff that is at least a week or two old. Because it in most cases takes few commits and days to produce solid solution :)