Author: Tim Hunt
MDL-20636 Cleanup in the upgradehelper plugin.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=22cd62caa9ec87ac8be5c90effd002864e44be43
http://github.com/moodle/moodle/commit/22cd62caa9ec87ac8be5c90effd002864e44be43
+ 2.1dev en [listpreupgrade,local_qeupgradehelper]
+ 2.1dev en [listpreupgrade_desc,local_qeupgradehelper]
+ 2.1dev en [noquizattempts,local_qeupgradehelper]
+ 2.1dev en [notupgradedsiterequired,local_qeupgradehelper]
+ 2.1dev en [upgradedsiterequired,local_qeupgradehelper]