Add headers to stop auto-responders from replying

    Precedence: bulk
    Auto-Submitted: auto-generated

are the headers we're adding.  This should mean that vacation auto
responders don't bother sending a reply to us.

Background reading at http://stackoverflow.com/a/301958/3189
Merge pull request #181 from foobacca/sending_headers

Sending headers
Organization options moved onto one line in preparation for groups.
Removed unnecessary import.
Merge pull request #183 from philmcmahon/org-list-one-line

Add extra page for organization admin links, move org options on to one line.
(Work for http://aptivate.kanbantool.com/boards/5986#tasks-2188187)
Merge branch 'develop_main' into develop