for #687 - speed up checkFiles() by changing some calls to more effienctly use pyfits
for #687 - speed up checkFiles() by changing some calls to more effienctly use pyfits

git-svn-id: 6d9763a5a770351123389058c013888add577529@19559 fe389314-cf27-0410-b35b-8c050e845b92

spacetelescope/stsci.tools