changed some capacitor values to improve low frequency performance
added resistors to decrease clock signal overshoot
exposed GND through mounting holes
grounded pushbutton mechanical support
fixed GP_CLKIN passives
adjusted clock generator output drive strength
another clock strength adjustment
improved REF_IN passives
improved XTAL2 (MAX2837 reference clock) passives
nudged pushbuttons
nudged USB conector
lengthened USB TVS pads
resized USB connector holes
changed to SMT RTC crystal.  populating for now.  might not in the future.
clippable GND test point
optional passives between USB shield and GND
relabeled LED2 and LED3 to RX and TX
blinky update for HackRF One
analog baseband header consolidation
trace bug introduced previous commit