forum-newdiscussion

Hi,

Added a new function (in includes/) as getting the data generator could be usual, in fact I'm evaluating moosh to use it as the data generator for moodle's performance tests (we auto populate moodle database and generate a jmeter test plan from a few values to run it in CI servers) so the more stuff (like activities, block instances...) we can find in the tested courses the more performance regressions we can detect.

About the category/plugin naming I had doubts again (mod_forum|forum-newdiscussion or forum-discussion with an extra add|delete argument... let me know if you have any preference)