Enable RC calibration mode during RC calibration to tell vehicle to ignore stick inputs for that period

Added more generated files to the .gitignore.

Updated Linux build info in readme

Remember to init submodules for "qupgrade"

Even more warnings

Reorder warnings

Update to Eigen 3.2.0

add xbee library folder for linux

disable -Werror

Warnings work

TeamCity caught this, but I thought the error was from my warnings
work. Turns out it was a real build failure. Windows doesn’t know which
floating point floor to use. In reality the parentheses are in the
wrong place and should be the floor of the divide by 2. But integer
division is always floor, so it’s not needed at all.

C4018, C4063

This reverts commit edba7fa8aef832661b33d85109d0bfdf51d024d2.

Pulled fixe from latest eigen across. Figured it was safer to patch
than to pull across whole new version of eigen.

Always evaluated to false due to signed/unsigned