Possible bug with XtDestroyWidget in main.c and messages_gui.c

[we7u]

This looks related to bug #88. I ran through all of the C-code looking at where XtDestroyWidget was used, then checked whether there were associated callbacks that might still hang around. These two files need a more detailed look to determine whether XtRemoveCallback() may be warranted before the XtDestroyWidget() calls:

main.c: Line 9759
messages_gui.c: Code associated with mw[i]

Note that there may be TWO LEVELS of callbacks in main.c:BuildPredefinedSARMenu_UI()

Most likely they need XtRemoveCallback() and XtFree() just like line 621 of list_gui.c

Look for XtFree through the code.

list_gui.c:390 should probably get the same treatment as list_gui.c:625. It is probably at least a memory leak but could also leave callbacks around that could be activated against long-closed Station List windows.