[Bugs] #990 LOW: Unpin object

[SugarLabs Bugs]

#990: Unpin object
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    Reporter:  erikos       |          Owner:  garycmartin                
        Type:  enhancement  |         Status:  accepted                   
    Priority:  Low          |      Milestone:  Unspecified by Release Team
   Component:  Physics      |        Version:  Unspecified                
    Severity:  Minor        |     Resolution:                             
    Keywords:               |   Distribution:  Unspecified                
Status_field:  New          |  
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Comment(by asaf):

 The method called in tools.py to destroy a body belongs to Box2D. There is
 a method to destroy joints as well. The destroy tool calls a method from
 elements called get_bodies_at_pos and then calls DestroyBody. We only need
 to create a similar method like get_joints_at_pos and then call
 DestroyJoint.

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Ticket URL: <http://dev.sugarlabs.org/ticket/990#comment:3>
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