fcl-db: cosmetic

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26947 3ad0048d-3df7-0310-abae-a5850022a9f2
fcl-db: dbtestframework: start work on MS SQL tests. 
* Create FPDEV_FIELD table with columns that accept null values for non-primary key.



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26948 3ad0048d-3df7-0310-abae-a5850022a9f2