Git commits in Moodle 1.6.6 by mjollnir_

commit 284060cc7e4d8097971d2af1131c736482ce2387
Author: mjollnir_ <mjollnir_>
Date:   Thu, 12 Apr 2007 07:51:19 +0800
Tag:    v1.6.6

fixing warnings in stats lib - rather than doing an include_once and noticing for every missing mod, check the file exists first