Optimised layout on inner layer.

Added multi-layer polygon for GND.

Reversed PTC inputs on connector.

Continued placement.

Layout : continued placement.

Corrected missing connections on connectors.

Correction on power supplies assignation.

Layout : started placement.

Layout : drawn edge cut, mounting holes placed.

Misc corrections.

Re-assigned inputs.

Re-assigned logical inputs to input capture.

Assigned analog mux commands.
Assigned relay commands.
Assigned digital outputs commands.

Added diag on open-collector outputs and 0-10V outputs.
Connected analog multiplexer.

Added thermocouple and PT100 interfaces.