. rename message fields to endpoint variants

. remove or optionalify some pci debugging stuff

lib/syslib/sys_endsig.c

@@ -9,7 +9,7 @@ int proc_nr;				/* process number */
     message m;
     int result;
 
-    m.SIG_PROC = proc_nr;
+    m.SIG_ENDPT = proc_nr;
     result = _taskcall(SYSTASK, SYS_ENDKSIG, &m);
     return(result);
 }