- version number back to 230 for current winGUI compatibility (will switch later to 240 for final 2.4)
- MSP_PRIVATE returns an error status, needed for third party tools (http://www.multiwii.com/forum/viewtopic.php?f=8&t=5852#p59472  https://code.google.com/p/multiwii/issues/detail?id=16 )
- bug: navigation SET_HEAD was reciprocal (https://code.google.com/p/multiwii/issues/detail?id=15)
- bug: navigation Compatibility flag was set even when MSP_WP is disabled. now tied to USE_MSP_WP (http://www.multiwii.com/forum/viewtopic.php?f=8&t=5852#p60109)

git-svn-id: http://multiwii.googlecode.com/svn/trunk/MultiWii_shared@1733 02679b44-d973-9852-f2fa-63770883b36c