Author: Mark Nelson
MDL-58907 block_myoverview: added setting to select default tab
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ff6cd55d7922ffc8dc997eaa9c461f5180a49d55
http://github.com/moodle/moodle/commit/ff6cd55d7922ffc8dc997eaa9c461f5180a49d55
+ 3.4 en [defaulttab,block_myoverview]
+ 3.4 en [defaulttab_desc,block_myoverview]