HackRF One documentation update
Merge branch 'master' of github.com:bvernoux/hackrf into bvernoux-master
removed old cpldjtagprog. use hackrf_cpldjtag with hackrf_usb firmware.
write unsigned chars to .wav file instead of signed chars
readability suggestion from the likely less sleep deprived
changed corner holes from 3 mm to 3.2 mm
nudged edges 0.4 mm where plastic was overly thin
tightend up edge cut-out for buttons
changed shape of hole to include P3
minor trace width fix
made mounting holes explicitly DNP
firmware build instructions with BOARD=
cpld/README
committed missing gerber files
increased SKY13317 pad size
updated date on silk screen
commented si5351c_activate_best_clock_source() trying to solve intermittent USB failures
si5351c_activate_best_clock_source() when starting RX or TX
Add signal source mode to hackrf_transfer

Now hackrf_transfer can act as an analog signal source to generate a
pure SINE wave at the given frequency.
Minor changes to tx_callback

Finalize the error procedure that was accidentally deleted.