Turn a charcter string into a binary number
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 Syntax

        GT_Binary(<cString>) -> <cBinary>

 Arguments:

      <cString> is any text string of alphanumerics

 Returns:

      <cBinary> is a string.  Each byte represents one bit.
                Eight 'bits' make up the ascii number (in
                binary) of the original string.

 Description:

      Turns a character string into a binary number, where
      every eight bits represents the ascii value of one
      byte from the original string, in binary notation.

      This can be used for encryption, bit twiddling,
      bit stripping etc.

 Examples:

      GT_Binary('AB') -> '0100000101000010'

 Source: GTMATH01.PRG

 Author:  Philip Ide