Issue #677:

* drop workaround for application crash on WinXP, when loading newer libmariadb (see #79)
* raise TDbLib's own exception instead of baking an own one with less details. Probably helps in debugging: https://www.heidisql.com/forum.php?t=34044
* rename EDatabaseError to EDbError, to overcome naming conflict in DB unit
* load libpq.dll always with path, which should anyway work better than without it. See http://www.heidisql.com/forum.php?t=22514

source/routine_editor.pas

@@ -526,7 +526,7 @@ begin
     btnDiscard.Enabled := Modified;
     Mainform.actRunRoutines.Enabled := True;
   except
-    on E:EDatabaseError do begin
+    on E:EDbError do begin
       ErrorDialog(E.Message);
       Result := mrAbort;
     end;