Author: Andrew Davis (andyjdavis)
enrol MDL-25718 added ability to recover user grades from grade history
http://git.moodle.org/gw?p=moodle.git;a=commit;h=13ba90363484ae8f1abed0fab115909130be71f2
http://github.com/moodle/moodle/commit/13ba90363484ae8f1abed0fab115909130be71f2
+ 2.1dev en [recovergrades,core_enrol]