Author: Adrian Greeve
MDL-6424 - blocks - Adding a warning screen when the user clicks the delete link.
Conflicts:
lib/blocklib.php
http://git.moodle.org/gw?p=moodle.git;a=commit;h=155fd3f64baf059a02aa9886ee3dfb85901c1bf9
http://github.com/moodle/moodle/commit/155fd3f64baf059a02aa9886ee3dfb85901c1bf9
+ 2.3 en [deletecheck,core_block]
+ 2.3 en [deleteblockcheck,core_block]