Remove a directory.
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 Syntax

        GT_RmDir(<cDir>,[@<nError>]) --> lRemoved

 Arguments:

      <cDir> is the path of the directory.

      <nError> is an optional parameter that must be passed by reference.
      If the directory can't be removed the DOS error code will be placed
      in this variable.

 Returns:

      If the directory was removed , GT_RmDir() returns true (.T.), if
      not it returns false (.F.).

 Description:

      GT_RmDir() can be used to remove a directory.

 Examples:

      // Remove a directory.

      nError := 0
      if !GT_RmDir("Knight",@nError)
         ? "Error =",nError
      endif

 Source: RMDIR.C

 Author:  Dave Pearson