Added support to directly connect also to Microsoft SQL Server database.

Fixed direct connection to always use the same query as of UNION query SQL injection (= one query with multiple columns/entries output).
Minor fixes to Firebird/Access/SQLite connectors to use connector's execute()/fetchall() as wrapper for third-party libraries' methods.
Forced conf.timeout to 10 seconds when directly connecting to database.
Slightly improved regular expression to parse -d parameter.
Added import check for all connectors' third-party libraries.
Code refactoring:
* Moved conf.direct request to direct() function in lib/request/direct.py (code reused where needed).
* Back-delegated to generic connector close() and other methods.

plugins/dbms/access/fingerprint.py

@@ -140,6 +140,7 @@ class Fingerprint(GenericFingerprint):
     def checkDbms(self):
         if conf.dbms in ACCESS_ALIASES:
             setDbms("Microsoft Access")
+
             if not conf.extensiveFp:
                 return True