Added ubx configuration CFG-NAV5 to airborne with less than 2g acceleration (compiling, not tested)
The config message was wrong, corrected (not tested)
The CFG-NAV5 dynamic model is now checked as well
ubx with 38400 working, all messages seem to arrive, configuration procedure is still funny (work in progress)
Ubx configuration working again, gps app is still complicated and big but should be wrking better now
Merge branch 'feature_ubx_model_configuration' of https://github.com/julianoes/Firmware into sunday
HOTFIX: disable interrupt-driven I2C mode, configure pessimistic I2C timeout, correct handling of the NAK generation for I2C master reads.

This looks like it addresses the recent I2C lockup issue, unfortunately it also increases CPU consumption by ~5% for the I2C sensor bus.
Added logging improvements for microSD
Merge branch 'log_improvements' into sunday