added colorspace calibration function; included optional "/Alternate" PDF key for ICC profile embedding (rastertopdf)
updated lcms names to work on all versions in rastertopdf
Reduced color space handling to only PWG-supported color spaces in rastertopdf
some code polishing and removal of now unneeded functions in rastertopdf
added debug warnings for icc profile embedding in rastertopdf
fixed debug warning for loading profiles
fixed "profile_size" usage for building with lcms2 in rastertopdf