Merge chages made in Gnus trunk.

Merge chages made in Gnus trunk.

mailcap.el (mailcap-mime-extensions): Rename text/org to text/x-org.
gnus-draft.el (gnus-group-send-queue): Update the queue group in the group buffer after sending the queue.
gnus-draft.el (gnus-group-send-queue): Really refresh the queue group after sending.
gnus-agent.el (gnus-agent-send-mail): Ditto.
gnus-group.el (gnus-group-refresh-group): New convenience function.
message.el (message-bogus-addresses): Remove commented-out value.
message.el (message-check-recipients): Display the encoded version of the bogus address if they differ.
flow-fill.el (fill-flowed): Make `delete-space' option correspond to "DelSp" parameter in RFC3676.
gnus-sum.el (gnus-summary-move-article): Protect against backends (i.e., nnimap) returning nil as the article number.