Author: Mark Nelson
MDL-46064 install: prevent install/upgrade with MyISAM
http://git.moodle.org/gw?p=moodle.git;a=commit;h=71611510a0d676742b8e69119f1149eaaa633ce7
http://github.com/moodle/moodle/commit/71611510a0d676742b8e69119f1149eaaa633ce7
+ 2.9 en [unsupporteddbstorageengine,core_admin]