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(cherry picked from commit 7986d8da)

If a block is designed to only appear once per view, an error message will be
displayed when users try to add a second one to a given view.

(cherry picked from commit 9e74277a)

Conflicts:

	htdocs/theme/default/templates/view/blocktypelist.tpl

Get subscribers to forum post notifications when processing activity, not when queueing it (bug 3351)

They're looked for based on the mahra:field attribute. We're not looking
at mahara:artefacttype here at all, which maybe we should be if
mahara:field isn't present, but I don't think it'll matter too much.