Disable gps lat/lon cells for arducopter commands that don't accept them, like "Land"

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From the arducopter wiki(http://code.google.com/p/arducopter/wiki/AC2_Waypoints)

""NOTE for ArduCopter 2.x
When AC executes the Land command it will land from its current location. It 
will not fly to a location, then land like the planes do.If you want to land at 
a particular waypoint, you must fly to a normal WP, then the next command will 
be Land.
""

IMHO to avoid arducopter users confusion, maybe gps lat/lon cells could be 
disabled based on the command entered.
As stated in the wiki, "Land" do not read gps coordinates entered by the user. 
It would great to check with Jason which commands ignore gps lat/lon and 
disable them. 

Just a suggestion. Thanks for reading!

Original issue reported on code.google.com by alvare...@gmail.com on 20 Sep 2011 at 6:18

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Original comment by Meee...@gmail.com on 21 Sep 2011 at 9:38

• Changed state: Accepted

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Original comment by Meee...@gmail.com on 21 Sep 2011 at 9:39

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Original comment by Meee...@gmail.com on 26 Sep 2011 at 2:32

• Changed state: Fixed