BLTI-238

Add code to the table conversion checking to remove "NOT NULL" 
constraints if they are found on FOORM-controlled tables.

We will enforce "required=true" in the FOORM software layer instead.



git-svn-id: https://source.sakaiproject.org/svn/basiclti/trunk@126032 66ffb92e-73f9-0310-93c1-f5514f145a0a