Add checks to plagiarism form to see if grademark or peergrade mark are enabled before outputting
Merge pull request #56 from agrowe/develop_formfix

Change the plagiarism form to check if grademark or peermark are enabled before showing
Incorrect NULL value check fixed in PP cron.
Remove ability to set rubric if Grademark is not enabled in PP
Fix file errors page error caused by file absence. (thanks to Ruslan Kabalin)
Issue #55 check anonymous marking is enabled.
Issue #67 fix issue with date handling.
cron now looking for numeric grade instead of null value
Merge branch 'develop' into feature/2014012407

* develop:
  Issue #67 fix issue with date handling.
  Issue #55 check anonymous marking is enabled.
Docs and version numbers updated