a bit more cleaning up.

rename the main gui class

try to read use_pymol from system.params.gui.use_pymol
improve handling of list sorting in gui

the lists are sorted with a delay timer so that they are only sorted
reletively infrequently.

For a database of 50000 minima a single sort still takes 5-10 seconds.
This is unacceptable.  Perhaps the solution is to only store the lowest
few hundred minima in the database?
redo sort time using a single QTimer