swapMutation:

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   Swap mutation exchanges the positions of two randomly chosen genes in 
   a permutation

   Since version 7.
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   Form:
   [child] = swapmutate(par,bounds,genInfo,Ops)
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   ------
   Inputs
   ------  
   par               the first parent ( [solution string function value] )
   bounds            the bounds matrix for the solution space
   Ops               Options for binaryMutation [gen prob_of_mutation]
   genInfo

   -------
   Outputs
   -------
   child

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