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 twWarnLine( Wait, InMsg, cJustify, nLine )
 ----------------------------------------------------------------------------
     Display a warning message on the screen row reserved for area
     messages with various exit modes. The only difference between this
     function and twInfoLine() is the default display colour, IF you
     initialize them! Portions of the string enclosed in (..) (CHR(174)
     and CHR(175) ) will be displayed in the enhanced colour, the
     remainder in the standard colour.  The '..' DO NOT add to the length
     of the string!

       Arguments:

     Wait   - 'N'  0 - Wait for a key press then restore the underlying
                       screen.

                   -1 - Leave the message on the screen and free the
                        stack allocation space.

                   -2 - Leave the message on the screen but keep it on
                        the stack to be released later with
                        twAMsgEnd().

                    n - Wait 'n' seconds or until a key is pressed,
                        then restore the underlying screen.

                    Wait defaults to 0.

     InMsg    - 'C' String to be displayed. The string may use two
                    colour attributes. ( See cJustify ) The string will
                    be truncated to fit on the screen.

     cJustify - 'C' "R" - Right Justify the string.

                    "C" - Center Justify the string.

                    "L" - Left Justify the string.

                    "P" - Left justify the string. This is a compatibility
                          function for old versions of TSDWIN and will not
                          be supported in the next release.

       Return:

     The exit key or 0.

       Example:

     twWarnLine( -2, "Press .ESC. to Exit" )

     'ESC' is displayed in the enhanced colour, the rest in the
     standard colour.