Changes marked with * are finished in current

Changes from r1a:
* DCR011203U connections are wrong:
  * C45 should go between VREC and PICGND
  * ENABLE should be connected to VREC

- Optocouplers need pullups on the output (reworked with 820 ohms)

* Optocoupler pins 3,4 are reversed

- Document connectors on silkscreen
