Turns a Decimal number into a binary string
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 Syntax

        GT_DtoB( <n> ) --> <cBinary>

 Arguments:

      <n>  is any decimal integer

 Returns:

      <cBinary> is a string representing a binary number

 Description:

      This function turns a decimal integer into a binary string.
      This can be used for encryption, bit twiddling,
      bit stripping etc.

 Examples:

      ? GT_DtoB(255)     // '11111111'
      ? GT_DtoB(15)      // '00001111'

 Header File: gt_lib.ch

 Source: GTMATH02.PRG

 Author:  Philip Ide