Author: Petr Skoda
MDL-28158 add optional "Remember username" checkbox in login forms
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0342fc36099eaaf5971e601acd343180ada6908d
http://github.com/moodle/moodle/commit/0342fc36099eaaf5971e601acd343180ada6908d
+ 2.2 en [rememberusername,core_admin]
+ 2.2 en [rememberusername_desc,core_admin]