wspr decoder ported to C

I have recently (loosely) translated Joe's wspr decoder algorithm to C. It is available at: github.com/k9an/wsprcan

My version is not a direct translation, but it uses the same sequential decoding algorithm and performance seems to be comparable to wsprd, which is the decoder routine used by wspr-x. If you decide to try it out, I'd be interested in feedback.

73, Steve k9an