[mssql] test fix + due Java API refactorings #tables/#table_exists? changed
and it's probably fine that #table_exists? reports views as well - their only filtered out from #tables ... this is how most native adapters work as well
Fix #367 pagination not working with group on SQLSERVER 2000.
The pagination condition was added before the ORDER condition.
If there is a GROUP BY clause, the pagination was in the GROUP BY
instead of the WHERE clause. New approach is extraction each clause and
build a new proper query.
less artificial MS-SQL test failures on AR-2.3