Author: Adrian Greeve
MDL-39298 - gradebook: Added more delimiters for uploading and downloading the gradebook as a csv file.
New delimiters added: colon, semicolon
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bb2306eb7eaa91249dd6ea06da751346b9e646ca
http://github.com/moodle/moodle/commit/bb2306eb7eaa91249dd6ea06da751346b9e646ca
+ 2.5 en [sepcolon,core_grades]
+ 2.5 en [sepsemicolon,core_grades]