Author: Paul Holden
MDL-78454 files: add contenthash column/filter to file report entity.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c720c21aca95d13aaf69fc5fe8cf90ab577ced1d
http://github.com/moodle/moodle/commit/c720c21aca95d13aaf69fc5fe8cf90ab577ced1d
+ 4.3 en [contenthash,core_files]