v1.20.4

-- Change current supported snirf version to 1.1. This is NOT OFFICIAL yet. This is what I'm advocating needs to happen because we are changing SNIRF format.
-- Add forward compatibility for snirf in ProbeClass. New snirf tentatively version 1.1, sourcePos2D and detectorPos2D have 2 columns but we convert to 3 columns to be compatible with Homer3 application
-- Change GroupClass version to 1.1 to account for the change in acquisition layer changes (Snirf format changed)
-- Update python application SnirfClass.py and add AuxClass