Do not show the status text in the thread list.

* Fixed typo with context_module::instance
* Fixed use of $mod->get_context()

This is the way to clear atto drafts

Merge branch 'm28_MDL-47210_IIS_PATH_INFO_Ignored_In_Required_Login_Pluginfile_Redirect' of https://github.com/scara/moodle

With the implementation of per-discussion subscription, the current
discussion's subscription state must be shown.

Since this state belongs to the discussion rather than the forum, it
should be shown accordingly.  This change therefore includes the addition
of the discussion name as a heading on the page.

Fixed position dialogues use a different xy positioning than standard
dialogues so cannot use the scrollTop positioning method.

Conflicts:
	admin/tool/monitor/lang/en/tool_monitor.php