[Bug-XBoard] The clock stops if the board window is moved with stickyWindows on

[Byrial Jensen]

If I move the board window during a game while the stickyWindows option 
is actice, the clock for the player who has the move will most often - 
but not always - stop. The same happens if the window is iconified and 
deiconified.

I tried to find the reason but failed. But I made the following 2 
observations:

1) The window actions will trigger the function DelayedDrag() if 
stickyWindows is active, and DelayedDrag() uses XtAppAddTimeOut() like 
also the clock does. Could it really be that no more than one timer can 
be active?

2) The function ClockTimerRunning() is defined, but never called. I 
suppose it should be deleted.