+19Nov00=======================================================================
+1. improve reaping code a bit more.
+2. put some extra checking in the PC16,17,19,21 code.
+3. fix problem with the aliased user disappearing and loads of 'unitialised'
+messages coming out.
16Nov00=======================================================================
1. Alter the process reaping code in cluster.pl to use waitpid
12Nov00=======================================================================