- IMU code size reduction tuning the init values of LPF acc vector (~100 bytes less)
- MS baro code size reduction using a int64_t var instead on int32_t, casting avoided (~900 bytes less)

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1314 02679b44-d973-9852-f2fa-63770883b36c