v1.9.19

-- Added hmrR_MotionCorrectSplineSG.m to user function registry plus supporting user functions hmrR_MotionCorrectSpline_Nirs.m and hmrR_tInc_baselineshift_Ch_Nirs.m.
-- Changed registry to not load functions without a help section.
-- Fixed an issue in the help section of hmrR_MotionCorrectPCArecurse.m which was preventing it from being loaded into registry.