v1.4rc1 schematic review

v1.4rc1

v1.3

added clock mux that selects between MMCX and oscillator,
shield clips are DNP
fixed manufacturing issues - soldermask pockets

v1.3rc1

swapped EM1 wit EM0
added front panel grounding and SMA grounding resistors.

Urukul/v1.2

updated documentation and P&P files to fix #4
added stackup info to the Gerber files.
PCB was not modified.