Version 1.7.0.

Merge branch 'HEAD' of https://github.com/RhinoDevel/raspi-bare-metal…

…-playground.git

Enable release mode.

Disable video (does not work on Raspi 2, yet); Add status LED flashin…

…g on mode startups.

Fix typo; Remove work-in-progress hint.

Enable NDEBUG macro. => Release mode build.