LFIT v2.31

Minor bug-fixes.

LFIT v2.30

Numerous performance updates including parallelization and GUI simplification.

LFIT v2.23

Pixel Aperature

Fixed a bug in Prerun GUI which did not allow the size of the pixel
aperture to be changed based on magnification/camera specs. Fix results
in improved depth accuracy of all refocusing options. --edm

LFIT v2.22

Git Restructure (LFITv2_22)