am 98c56e65: Adding an improved version of the Accelerometer tester, which works more reliably. Also a first cut at a Magnetometer tester, but this requires real-world testing to make sure it actually works.

Merge commit '98c56e6588b5a5bb435e8e76d35ff78a242e1604' into froyo

* commit '98c56e6588b5a5bb435e8e76d35ff78a242e1604':
  Adding an improved version of the Accelerometer tester, which works more