db Helper Update & Add frmDbTester

Moved all db test buttons to a new form - frmDbTester
Can be access from db tester button on main menu.

Completed functionality dbHelper:
-dbSelectAll(string tblName)
-dbScalar(string tblName, string scalarExpretion)
-dbScalar(string tblName, string scalarExpretion, string whereCondition)