Do not log article updates

It seems to work well, and there are too many such updates.
BTW, we should have a verbose/insane log level.

app/Controllers/feedController.php

@@ -359,8 +359,8 @@ class FreshRSS_feed_Controller extends Minz_ActionController {
 							//This entry already exists and is unchanged. TODO: Remove the test with the zero'ed hash in FreshRSS v1.3
 							$oldGuids[] = $entry->guid();
 						} else {	//This entry already exists but has been updated
-							Minz_Log::debug('Entry with GUID `' . $entry->guid() . '` updated in feed ' . $feed->id() .
-								', old hash ' . $existingHash . ', new hash ' . $entry->hash());
+							//Minz_Log::debug('Entry with GUID `' . $entry->guid() . '` updated in feed ' . $feed->id() .
+								//', old hash ' . $existingHash . ', new hash ' . $entry->hash());
 							//TODO: Make an updated/is_read policy by feed, in addition to the global one.
 							$entry->_isRead(FreshRSS_Context::$user_conf->mark_updated_article_unread ? false : null);	//Change is_read according to policy.
 							if (!$entryDAO->hasTransaction()) {