Author: Petr Škoda
MDL-35691 use bigint checker for all integers
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2b7fa4c175e99e103087a54c3d82c7baa4e07fe0
http://github.com/moodle/moodle/commit/2b7fa4c175e99e103087a54c3d82c7baa4e07fe0
+ 2.4 en [checkbigints,tool_xmldb]