Revert "Merge pull request #251 from ggeurts/NH3594-Mssql2012Dialect"

This reverts commit 8531dafd9e42fc4de9b00dc27934038520e28112, reversing
changes made to 8ddb41282ecc79c10236723d0d5228c098f44c68.

Merged caused 30 test failures.