on "for k in dcopy.keys():" line, we needed the sequence to remain an immutable copy during the loop
on "for k in dcopy.keys():" line, we needed the sequence to remain an immutable copy during the loop

git-svn-id: 40b96386cbba86590ff9370e0ea614b5cc88fc13@38251 fe389314-cf27-0410-b35b-8c050e845b92

spacetelescope/stsci.tools