Do not call stop() method on threads when aborting a transaction.

The method is deprecated, and it seemed to leave db connections in an
unreclaimable state.

src/helma/framework/core/RequestEvaluator.java

@@ -608,9 +608,8 @@ public final class RequestEvaluator implements Runnable {
 	        try {
 	            t.abort ();
 	        } catch (Exception ignore) {}
-	        try {
+	        // FIXME: do not call deprecated method stop() on threads -
-	            t.stop ();
+	        // do we need a substitute for it?
-	        } catch (Exception ignore) {}
 	    } else {
 	        notifyAll ();
 	    }