[Trac #1120] Fixing txpower for testing purposes

[Zarro Boogs per Child]

#1120: Fixing txpower for testing purposes
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 Reporter:  carrano      |       Owner:  marcelo                   
     Type:  enhancement  |      Status:  new                       
 Priority:  normal       |   Milestone:  Untriaged                 
Component:  wireless     |    Keywords:  txpower transmission power
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 For the purpose of tests, one useful feature would be possibility of
 fixing the txpower on XOs.

 This way we could get more control over interference ranges and perform
 better multi-hop tests.

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Ticket URL: <http://dev.laptop.org/ticket/1120>
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