Hello,

This patch introduces a new server variable, nnimap-hide-deleted. If
non-nil, articles with the IMAP \Deleted flag will not be included in
Summary buffers.

This is intended to increase operability with other IMAP mailreaders and
the new 'never value for nnimap-expunge (see patch in bug 20670).

Changes in v2:

  * Take into account that server may send the UID, FLAGS and RFC822.SIZE
    response data items in arbitrary order

Changes in v3:

  * Made first line of docstring a complete sentence.

Thanks for considering,
-Nikolaus

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