. rename message fields to endpoint variants

. remove or optionalify some pci debugging stuff

lib/syslib/sys_kill.c

@@ -7,7 +7,7 @@ int signr;			/* signal number: 1 - 16 */
 /* A proc has to be signaled via MM.  Tell the kernel. */
   message m;
 
-  m.SIG_PROC = proc;
+  m.SIG_ENDPT = proc;
   m.SIG_NUMBER = signr;
   return(_taskcall(SYSTASK, SYS_KILL, &m));
 }