Author: Daniel Neis Araujo
MDL-50430 forum: Add number of subscribers to forum subscriber list
http://git.moodle.org/gw?p=moodle.git;a=commit;h=54cf94390b72cebc490116a5ed68a7f70e012cbd
http://github.com/moodle/moodle/commit/54cf94390b72cebc490116a5ed68a7f70e012cbd
+ 3.0 en [subscriberstowithcount,mod_forum]
+ 3.0 en [subscribersto,mod_forum]