add arduplane level
more image georef options - now does gpx for dronemapper.

Conflicts:
	Tools/ArdupilotMegaPlanner/Common.cs

navigation.pde: Put the new calc_GPS_velocity method in a compiler if that checks the new RETRO_LOITER_MODE config value (saves space and ensures its not being used unless retro loiter mode is enabled)

Loiter: Made the "retro loiter" routines configurable. Add RETRO_LOITER_MODE ENABLED to APM_Config.h to enable the older loiter shtuff.

language by hazy
move turning circle to be based on cog
add APPROACH
add autodec on/off
mod 3dr radio uploader to read in 64 byte packets
add more georef caching. much faster now on more than 1 run.

Planner/defines.h: Updated the enumeration value for APPROACH so as not to disturb the order of the universe.

add some Chinese translation

This is better since each project has very different options.

add ability to geotag images from log file. - will release guide soon

ArdupilotMegaPlanner: Added new APPROACH flight mode and added infrastructure necessary to make it private (ie. not a user selectable mode).

Following the instructions, using Tortoise.

add turn radius - status
add new pink line to Arduplane - turn radius