Allow PyMOL to load in a coarsened trajectory to save time

[Ryan Cocking]

PymOL can take quite a long time to load big FFEA trajectories. On my system (Intel core i5, nVidia 1050Ti) loading a molecule such as the kinetochore (3 rods, 8 blobs) for upwards of 500 trajectory frames can take around 10 minutes. The full trajectory is 10,000 frames, which would take around 3 hours!

I think a useful feature to the plugin would be to load in a coarsened trajectory, like only loading every 100 frames or so. I thought altering the ‘check’ field of the ffea script would do this already, but it does not.