Author: Eric Merrill
MDL-48618 gradebook: Only use individual min/max for aggrigate grades
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c07775dfff1bdc8b56daabe030f00890f0e2bf20
http://github.com/moodle/moodle/commit/c07775dfff1bdc8b56daabe030f00890f0e2bf20
+ 3.0 en [minmaxupgradedgrades,core_grades]
+ 3.0 en [minmaxupgradefixbutton,core_grades]
+ 3.0 en [minmaxupgradewarning,core_grades]
+ 3.0 en [upgradedminmaxrevertmessage,core_grades]