wip commenting spam report.
Use a more generic selector, since comments doens't give us much.
Add new tables and functionality for voting for comments
Prevent  course context errors
Do permisison check on can_post()
Only add comment 'report spam' links if not guest
Don't allow guest to report spam
Add a log entry for deleting a user
Remove unused lang string
Improve viewvotes.php titles
Fix lack of discussion query being executed

This prevented a spammer from being deleted when single forum post
was on existing discussion
MDLSITE-1620 - Add an ugly hack to load spam link on all comments
Only add spam links when logged in or not a guest
Don't require_strings_for_js twice uncessarily
Merge branch 'commenting-spam'