Allow mounting the APM board in any orientation on my airframe

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Feature that you'd like us to add or change you'd like us to make:

I would like to fly the APM board in any orientation on my airplane, with a 
user selectable orientation in the options file.  For example, i would like to 
fly with the APM servo connectors pointing FWD and the GPS point AFT, with the 
IMU shield facing UP.

Other orientations are also desirable.

This update might be similar to what is done on the UAV Dev Board.

****** Excerpt from UAV Dev Board options.h file ******
// Use board orientation to change the mounting direction of the board.
// The following 4 orientations have the board parallel with the ground.
// ORIENTATION_FORWARDS:  Component-side up,   GPS connector front
// ORIENTATION_BACKWARDS: Component-side up,   GPS connector back
// ORIENTATION_INVERTED:  Component-side down, GPS connector front
// ORIENTATION_FLIPPED:   Component-side down, GPS connector back
// The following 2 orientations are "knife edge" mountings
// ORIENTATION_ROLLCW: Rick's picture #9, board rolled 90 degrees clockwise,
//              from point of view of the pilot
// ORIENTATION_ROLLCW180: Rick's pitcure #11, board rolled 90 degrees clockwise,
//              from point of view of the pilot, then rotate the board 180 
around the Z axis of the plane,
//              so that the GPS connector points toward the tail of the plane
#define BOARD_ORIENTATION                                       
ORIENTATION_FORWARDS

Original issue reported on code.google.com by aerod...@gmail.com on 4 Sep 2011 at 6:37

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[deleted comment]

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Please see 
http://code.google.com/p/ardupilot-mega/issues/detail?id=345
and
http://code.google.com/p/ardupilot-mega/issues/detail?id=269

Original comment by justinbe...@gmail.com on 6 Sep 2011 at 12:46

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Original comment by amilcar....@gmail.com on 25 Sep 2011 at 9:27

• Changed title: Allow mounting the APM board in any orientation on my airframe
• Added labels: Priority-Low, Type-Enhancement

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Duplicates an earlier issue

Original comment by analogue...@gmail.com on 2 Jan 2012 at 9:08

• Changed state: Duplicate