CPU-DAC and GPIO header SPI control

[pathfinder49]

• Allow remote enabling and setting of the two CPU integrated DACs
• Allow remote writing of a 16 bit word to the GPIO header SPI
  • This was tested with the stabilizer_current_sense board.

[hartytp]

Marius, can you try not to commit in my name please?

[pathfinder49]

Marius, can you try not to commit in my name please?

Apologies, not sure what's causing the "hartytp committed" bit, I couldn't see it in my commit log. I was using git commit --author="Marius Weber <marius.weber@physics.ox.ac.uk>" for all commits...

[dnadlinger]

Apologies, not sure what's causing the "hartytp committed" bit

Git tracks two separate pieces of information for each commit, author and committer. If they don't agree, GitHub displays the "and … commited" lines.

I'm not sure whether there is a better way of overriding the latter than using the GIT_* environment variables.