[imp] reCaptcha implementation for IMP.

[Tobias Drewry]

I have just completed adding reCaptcha support to our installs of IMP  
4.3.4 and, our well aged, IMP 4.0.4.

If there is any interest in a patch, I'd be happy to put one together.

Regards,
Tobias Drewry
Boston University
tdrewry at bu.edu



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