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   Generate a pulsewidth modulated sequence given x. 
   If no outputs are specified it will plot the sequence.
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   Form:
   [tPWM, tSign, xPWM] = PWMSeq( m, dT, x, dTSeq, wDither )
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   Inputs
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   m         (1,1)   Magnitude
   dT        (1,1)   Sampling rate
   x         (n)     Input sequence
   dTSeq     (1,1)   Sampling time for the input sequence
   wDither   (1,1)   If add triangle wave dither to the output

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   Outputs
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   tPWM      (n)     Times for each pulse at each dTSeq
   tSign     (n)     Sign of the command
   xPWM      (n)     Value at each dTSeq

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