Author: Damyon Wiese
MDL-55767 competencies: Better exceptions for persistent
The persistent exceptions "squash" all the details and only display
them to developers. This leads to generic "Invalid persistent" messages
with no explanation. Instead lets include the message detail always.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9e14057444e541840753884fb345de304282ae55
http://github.com/moodle/moodle/commit/9e14057444e541840753884fb345de304282ae55
+ 3.2 en [invalidpersistent,core_competency]