Author: Mark Nelson
MDL-57436 block_myoverview: added infrastructure for new block
Part of MDL-55611 epic.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3a37efa87fde22a12ead43d1c4f7cb7ef77b8fd8
http://github.com/moodle/moodle/commit/3a37efa87fde22a12ead43d1c4f7cb7ef77b8fd8
+ 3.3 en [myoverview:addinstance,block_myoverview]
+ 3.3 en [myoverview:myaddinstance,block_myoverview]
+ 3.3 en [pluginname,block_myoverview]