v.1.23.1

-- Step 2 in allowing acquired file data such as stimulus conditions to be modified through a separate save procedure. Finished implementing this feature.
-- Add HDF5_DatasetWrite which allows overwriting of chunked datasets. This is what allows tims to be updated in a SNIF file after file creation.
-- Consolidate StimEditGUI file into one file (StimEditGUI.m).
-- Add small button to upper right corner of MainGUI.fig to easily shrink or expand GUI to fixed standard sizes, without having to resize by dragging mouse.