use irafutils.csvSplit() in sigStrToKwArgsDict()
use irafutils.csvSplit() in sigStrToKwArgsDict()

git-svn-id: e4aa3cfa51ba591d1cd1dbbaf7e4a2c2b5d7a7ff@7544 fe389314-cf27-0410-b35b-8c050e845b92

spacetelescope/stsci.tools