FIX BUG #55647, #60512, #60512, #61900, #64338, #64808, #63638

Return an error on passwords longer than 30 chars instead of segfault.
Set error and message handlers properly.
Do not segfault in out of bound colnums in getColumnMeta()
Fix DBSETOPT to use a blank string instead of NULL to stop FreeTDS complaints.
Use DBSETLDBNAME for compatibillity with SQL Azure.