[Discuss-gnuradio] hf explorer updated

[Chuck Swiger]

>UHD: moving HF apps from gnuradio-examples to gr-uhd/examples. Did the
>minimum possible work to convert HF Explorer to use UHD.

Thanks Tom - I've cleaned up a lot of other things and have an update in
my copy you can pull over: https://github.com/cswiger/gnuradio
https://github.com/cswiger/gnuradio/tree/master/gr-uhd/apps/hf_explorer

Fixed layout for new fft display, some variables and calculations for
uhd, etc.

I'm keen on getting 'click to tune' to work again on the fft display.