Author: Marina Glancy
MDL-74465 blocks: allow configuration in modal
Introduce 'pagehash' - an identifier that uniquely identifies a page for the user session
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6b081d2e9f58a82193d1fcd95214df79c11efd06
http://github.com/moodle/moodle/commit/6b081d2e9f58a82193d1fcd95214df79c11efd06
+ 4.2 en [addblock,core_block]
+ 4.2 en [editedpagenotfound,core_error]