Author: Simey Lameze
MDL-60060 mod_data: add calendar drag and drop callbacks
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5e401a2a5172ba4dba5ca2acfbfd8f8c6ce53375
http://github.com/moodle/moodle/commit/5e401a2a5172ba4dba5ca2acfbfd8f8c6ce53375
+ 3.5 en [closebeforeopen,mod_data]
+ 3.5 en [openafterclose,mod_data]