Test the setting of a flag in a bit flag string.
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 Syntax

        GT_IsFlag(<cFlagString>,[<nFlag>]) --> lSetting

 Arguments:

      <cFlagString> is a bit flag string created with GT_NewFlag()

      <nFlag> is the flag to be tested.

 Returns:

      A boolean value, TRUE if the flag is on, FALSE if it's off.

 Description:

      GT_IsFlag() is used to test the state of a flag with a bit flag
      string.

 Examples:


      // Print the setting of the flags in a flag string called ``cDave''

      for nFlag := 1 to (len(cDave)*8)
         ? "Flag number ",nFlag," == ",GT_IsFlag(cDave,nFlag)
      next

 Source: BITFLAGS.C

 Author:  Dave Pearson