FloatToTwosComplement:

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   Converts a float to two's complement array. For example:
   [1 1 1 0 0 1 0 1] = FloatToTwosComplement( -27, 8, 1 )
   [0 0 0 1 1 1 0 0] = FloatToTwosComplement(  28, 8, 1 )

   Type FloatToTwosComplement for a demo.
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   Form:
   b = FloatToTwosComplement( f, n, bigEndian )
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   ------
   Inputs
   ------
   f                       Float
   n                       Bits per word
   bigEndian               1 == big endian [msb...lsb] else
                           [lsb...msb]

   -------
   Outputs
   -------
   b                       Binary array

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