XPnlsFunc()
  Get the current setting of NLSFUNC
------------------------------------------------------------------------------

  Function:    XPnlsFunc()

               When NLSFUNC is installed, the Application
               has access to more countries that the current
               one. One can then select other countries than
               the default. Which countries are actually
               supported depends on the version and
               nationality of DOS. In the Dutch version, I found that
               most of the Surrounding European countries were
               supported (and, regretfully, not Japen, for instance).

               In some sitautions you may want to inform your
               user to install NLSFUNC.

  Syntax:      XPnlsFunc() --> lNlsFuncInstalled

  Arguments:   None

  Returns:     Whether NLSFUNC is installed.

  Usage:       if !XPnlsFunc()
                   MyAlert("Install NLSFUNC!")
                   quit
               end