 
  desc: Copy dir into target dir.
       
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  format: cp <pathSrc> <pathDest> [name] [scriptFileName]
  
          You need name and scriptFileName if you copy material, particle or gpuProgram.
          The copy must be meaningful.
          You must copy affector or emitter to particle. Or copy particle to particle root.
          You can not copy technique to particle.

          scriptFileName work the same as add command.
                                                            
  eg : cp PointEmitter0 .
       cp fire . newFire firework.particle

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 special case you should know:
 
 copy targetpass or target output:

    cp path1 path2 [TargetOutput]

Part1 or path2 can eight be target pass or target output. if "TargetOutput" is not specified,
ose will create new target pass for you, otherwise original targetoutput will be overwrited.
  
  