- adapt MSP_WP and MSP_SET_WP structure according to http://www.multiwii.com/forum/viewtopic.php?f=8&t=2034&start=360#p31354
- correct SERVO_MIX_TILT with RC superposition according to this suggestion
http://www.multiwii.com/forum/viewtopic.php?f=16&t=3092&p=31207#p31207



git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1349 02679b44-d973-9852-f2fa-63770883b36c