Store image upload time for Ptiff Images
Fix a small bug

'reversed' returns a reverse iterator, which cannot be directly
concatinated with a list
Allow ptiff views to not be in a session when refreshing them
Merge branch 'ptiff_upload_time'

* ptiff_upload_time:
  Allow ptiff views to not be in a session when refreshing them
  Fix a small bug
  Store image upload time for Ptiff Images