[Etoys-notify] #6866 NORM Update.: Add sign() function

[Zarro Boogs per Child]

#6866: Add sign() function
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 Reporter:  bert            |       Owner:  etoys   
     Type:  defect          |      Status:  new     
 Priority:  normal          |   Milestone:  Update.2
Component:  etoys-activity  |     Version:          
 Keywords:                  |    Verified:  0       
 Blocking:                  |   Blockedby:          
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 ... it's useful for various animation tasks (at least I missed it).

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Ticket URL: <http://dev.laptop.org/ticket/6866>
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