Merge technobit (nanofury) patch to master branch

[utdrmac]

The technobit patch allows for NanoFury and YellowJacket USB miners to work with RaspberryPi without the need for hidapi. The patch, as downloaded from technobit, can only be applied successfully to cgminer 3.6.5. This pull request applies the same patch to the 3.12 main line. (Tips: 1drmacW6UYAfHNjRrxN7SYuN3Q9R9v6K6)

[ckolivas]

There are numerous code changes in this push which are in core cgminer code for displaying, usb hotplugging and the API which are invasive and needlessly change the way the core code, display and api work. There's also a great big debug output as a comment in the patch explaining why hotplug should be disabled for the driver instead of fixing whatever problem the patch has with hotplug. There is also an official U1 driver, even if it is very simple by comparison that should be built on - without affecting other devices that use the icarus driver - instead of adding another driver for it.

[utdrmac]

I'm not the original author of the patch. All I did was make it work with latest cgminer. All I can say is that with the patch on a RaspberryPi, I have 0 issues making nanofury/yellowjacket work. Without the patch, NF/YJ are either A) not recognized or B) underperform. I can't speak for the code; I can only speak for the results and the results are better than NF/YJ running with bfgminer on MacBookPro

[ckolivas]

I know you're not the author, I'm explaining why it's not suitable as is. I'd be happy for someone to modify it to fix the above problems and then I'd merge the code.