DP-F / N controller and firmware update

Firmware update for v116 firmware, v1 DP-F and DP-N amplifiers, and an associated new v118 DSP controller software package.

It addresses two important bug fixes;

1. Fixed issue with limiter settings changing when switching to bridge mode.
2. Optimisation of Open circuit detection, to reduce false positive warnings being shown.

It’s important that all customers update relevant amplifiers to this version ASAP. Instructions are included in the software package, please read carefully before running the firmware update.