* Connect input header CV/GATE rails to the bus, this makes it possible
to chain boards into the same bus using the existing headers on the
output header.
* Move the via's for the +12V rail to the tile power connections so it
doesn't cross most of the GND signal path on the top ground plane.
Power distribution for 5 shrouded Eurorack power headers and 5 1u tile
power solder points. Layout is left to right, this may not be the most
optimal orientation.
