Author: Paul Holden
MDL-66917 admin: validate uploaded plugin version.
Prevent overwriting current plugins with older versions of themselves.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=059f402a51727d4bfdb937eaf46d7d65ade582bf
http://github.com/moodle/moodle/commit/059f402a51727d4bfdb937eaf46d7d65ade582bf
+ 3.8 en [validationmsg_pluginversiontoolow,core_plugin]