Author: Stephen Bourget
MDL-54910 mod_data: Open dates should be before close dates
http://git.moodle.org/gw?p=moodle.git;a=commit;h=14c7153625eed3b82cd15f3a77f4bbf7fc666946
http://github.com/moodle/moodle/commit/14c7153625eed3b82cd15f3a77f4bbf7fc666946
+ 3.0 en [availabletodatevalidation,mod_data]
+ 3.0 en [viewtodatevalidation,mod_data]