[Bugs] #1615 UNSP: Add a button in Physics Activity to clear off the whole screen at once

[Sugar Labs Bugs]

#1615: Add a button in Physics Activity to clear off the whole screen at once
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    Reporter:  mchua                      |          Owner:  garycmartin                
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Physics                    |        Version:  0.84.x                     
    Severity:  Unspecified                |       Keywords:                             
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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Comment(by mkim):

 I was informed about the change my sister Audrey came up with for the
 activity by Mel and I'd like to also help out in some way or another.  I'm
 pretty much a newbie, so I don't know how much help I'd be [plus I'm still
 in school so time is a bit limited] but maybe it's a good time to learn?

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1615#comment:2>
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