[GHC] #8070: Use a captcha for trac registrations

[GHC]

#8070: Use a captcha for trac registrations
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        Reporter:  igloo             |            Owner:  hvr
            Type:  task              |           Status:  new
        Priority:  high              |        Milestone:
       Component:  Trac & Git        |          Version:
      Resolution:                    |         Keywords:  trac admin
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by hvr):

 Fyi, right now we have a simple text-based algebraic expression captcha in
 place which seems to keep off spammers for now...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8070#comment:8>
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