SM6FBQ / HackRF clone - History

libhackrf: counts the open devices, prevents exit if not all closed

fixes #435, osmosdr calls hackrf_exit for the last sink and the last
source. If both are in one flow graph the desctructor of the source
fails as the sink already closed the usb context.
This prevents hackrf_exit to close the context if not all devices are closed

Merge pull request #434 from dominicgs/flash-investigation

Allow users to interact with the flash status register

Merge branch 'mossmann-master' into flash-investigation

Use pip2 rather than pip because it's not available with xcode 8.3

Wrong localtime argument type in hackrf_sweep causes crash on win 10
Thanks jaredd

Merge pull request #427 from dominicgs/clock_util

Clock util

Merge pull request #399 from yhetti/master

Added decoupling capacitors to Operacake.

hackrf_clock: Allow CLKOUT to be enabled / disabled
hackrf_clock -o 1 / hackrf_clock -o 0

SPI Flash: add function to clear SPI flash status register