some more bug fix to hs_core
bug fix in models.py - yet to unit test the changes
file permission changes only
merged hs_core_bug_fix remote branch
update unit test for core metadata
merged remote hs_core_bug_fix
Bug fix to ExternalProfileLink and Party metadata element models
Fix to bug#18 additional sub elements for Coverge element
trying to fix merging issues with django_irods
merged with master
fixed the bug of reverse relation name problem with AbstractMetaDataElement class
Merge branch 'hs_core_bug_fix' into AGU
changed unit to units as key to conform to Pabitra's coverage implementation for projection and units