Record creator in history

[radarhere]

#1087 reports that a person's creator is not displayed anywhere.

This PR suggests extending the 'Created' entry in the 'History' tab to 'Created by John Smith (#1)', like the 'Updated by' entries.

jethro-pmm/include/db_object.class.php

Lines 366 to 368 in d47be60

	$user = $GLOBALS['user_system']->getCurrentPerson();
	$now = time();
	$this->values['history'][$now] = 'Updated by '.$user['first_name'].' '.$user['last_name'].' (#'.$user['id'].")\n".implode("\n", $changes);

This wouldn't change anything for entities already created, but it would show the information for entities created moving forward.