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/oracle/fingerprint.py

@@ -78,9 +78,6 @@ class Fingerprint(GenericFingerprint):
         return value
 
     def checkDbms(self):
-        logMsg = "testing Oracle"
-        logger.info(logMsg)
-
         if conf.dbms in ORACLE_ALIASES:
             setDbms("Oracle")
 
@@ -89,6 +86,9 @@ class Fingerprint(GenericFingerprint):
             if not conf.extensiveFp:
                 return True
 
+        logMsg = "testing Oracle"
+        logger.info(logMsg)
+
         # NOTE: SELECT ROWNUM=ROWNUM FROM DUAL does not work connecting
         # directly to the Oracle database
         if conf.direct: