Add radius to DO_REPOSITION

[magicrub]

Add Radius to CMD_DO_REPOSIITON for better atomic operations of control on guided commands. It uses language from the other CMD_NAV_LOITER commands.

Here's the same commit in a ArduPilot/mavlink PR: ArduPilot#240

I've discussed this with @WickedShell who's in favor of it.

[magicrub]

I'm having second thoughts about this. Would probably be better to just use a new enum entry in MAV_DO_REPOSITION_FLAGS to say radius is included and overrides the yaw value for planes

[WickedShell]

Either way works for me...

[magicrub]

I'll re-work it so there's a new enum flag to re-purpose the yaw field for fixed-wing forward-moving vehicles

[hamishwillee]

I understand the purpose of radius, but not clear to me what you expect this MAV_DO_REPOSITION_FLAGS update to do. I.e. I see this as yaw (mc) or rotation direction (fw), but what value making the flag change has eludes me.

[hamishwillee]

@magicrub I'm closing this as "stale". You're welcome to reopen with work proposed in #1787 (comment) and answers to #1787 (comment)

[magicrub]

@hamishwillee I've pushed changes, please re-open.

[hamishwillee]

@magicrub I'm sorry, but it won't let me because it has been force pushed. I have no idea why that is "not allowed", but I don't have the rights to reopen. You might have to push to a new branch and recreate/cross link this. Sorry.

[magicrub]

replaced by #1825