Increase spacing on RF traces, and fix/approve DRC violations.

Add antenna net and add 50mil of clearance around those traces, approve all the DRC violations that result.

Fixup a handful of other DRC violations, some min-spacing violations.
Approve all the restricted violations that are OK.
Merge pull request #4 from andyw-lala/master

Increase spacing on RF traces, and fix/approve DRC violations.