Update DB IO for query hash storage and parameter count

The parameter count methods in the PgSQL class have changed
- the function returns a unique list of $ parameters

The count is now done in the DB IO part where it counts over the unique array

Query hash is stored like the query for the current run one (reset on dbExec call).
The method to create the hash is renamed to dbBuildQueryHash instead of "Get".
The dbGetQueryHash function now just returns the last set query hash. There is a matching dbResetQueryHash for unsetting the query hash.

4dev/tests/DB/CoreLibsDBIOTest.php

@@ -5009,8 +5009,8 @@ final class CoreLibsDBIOTest extends TestCase
 				)
 			),
 			($params === null ?
-				$db->dbGetQueryHash($query) :
-				$db->dbGetQueryHash($query, $params)
+				$db->dbBuildQueryHash($query) :
+				$db->dbBuildQueryHash($query, $params)
 			),
 			'Failed assertdbGetQueryHash '
 		);