[cvs-nhc98] patch applied (hat): Fixed problem: java thread remained in memory when killing TraceFrame

[Malcolm Wallace]

Fri Oct  5 02:47:57 PDT 2001  thorsten
  * Fixed problem: java thread remained in memory when killing TraceFrame
   by top-right "x" button (instead of using "Exit" in the menu).
   Explicit call to System.exit added to ActionListener "windowClosing"
   to stop java's event manager.

    M ./src/old/trail/TraceFrame.java +2