1.28.7

-- Fix Homer3 not detecting and not offering to convert all .nirs files if even one .snirf exists in a group folder. It should offer to convert to .snirf whichever .nirs files have not been converted to .snirf.
-- Add some improvements to the debug messages in Nirs2Snirf and related functions used to convert .nirs to .snirf
-- Replace convertToStandardPath with filesepStandard for uniformity everywhere possible. Didn't do it everywhere because convertToStandardPath behaves slightly differently in the case of relative path it converts to absolute path whereas filesepStandard does not. So in cases where there might be a relative path which is necessesary I didn't replace with filesepStandard.