v1.31.2

-- Fix StimClass loading stims from .snirf file incorrectly because one of the stim names passed as an argument ('Same in this case') was icorrectly interpreted as a file name instead of condition name because the file ('same.m') was found in the Matlab search path. This caused an error. The fix was to replace matlab's exist() function with our own ispathvalid() which does the correct thing to identify whether a string is a valid pathname.

-- Fix incomplete fix to calculating bbox in DisplayAxesSDG. The bug was that the when clicking on channels in MainGUI axesSDG they would not be shown in colors but remained gray even though it seemed like they were being selected because their data showed up in axesData