Author: Jun Pataleta
MDL-66481 mod_forum: Implement additional column sorting
Implement sorting for the following columns:
* Discussion name
* Discussion starter name
* Group
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bc23cbaf548bf8007c8ae68ff8abc98c319aa94f
http://github.com/moodle/moodle/commit/bc23cbaf548bf8007c8ae68ff8abc98c319aa94f
+ 3.8 en [discussionlistsortbydiscussionasc,mod_forum]
+ 3.8 en [discussionlistsortbydiscussiondesc,mod_forum]
+ 3.8 en [discussionlistsortbygroupasc,mod_forum]
+ 3.8 en [discussionlistsortbygroupdesc,mod_forum]
+ 3.8 en [discussionlistsortbystarterasc,mod_forum]
+ 3.8 en [discussionlistsortbystarterdesc,mod_forum]