for pyraf ticket #214; allow iraf-home-dir to be ~/.iraf
for pyraf ticket #214; allow iraf-home-dir to be ~/.iraf

git-svn-id: 40b96386cbba86590ff9370e0ea614b5cc88fc13@31249 fe389314-cf27-0410-b35b-8c050e845b92

spacetelescope/stsci.tools