Correcting numcombine.py bug.  The import of the 'image' package was causing a name collision with a variable named image used in 'for' loops.  This name collision resulted in function calls to ndarray objects instead of the actual function in the image module.
Correcting numcombine.py bug.  The import of the 'image' package was causing a name collision with a variable named image used in 'for' loops.  This name collision resulted in function calls to ndarray objects instead of the actual function in the image module.

git-svn-id: e4aa3cfa51ba591d1cd1dbbaf7e4a2c2b5d7a7ff@729 fe389314-cf27-0410-b35b-8c050e845b92

spacetelescope/stsci.tools