panic() cleanup.

this change
   - makes panic() variadic, doing full printf() formatting -
     no more NO_NUM, and no more separate printf() statements
     needed to print extra info (or something in hex) before panicing
   - unifies panic() - same panic() name and usage for everyone -
     vm, kernel and rest have different names/syntax currently
     in order to implement their own luxuries, but no longer
   - throws out the 1st argument, to make source less noisy.
     the panic() in syslib retrieves the server name from the kernel
     so it should be clear enough who is panicing; e.g.
         panic("sigaction failed: %d", errno);
     looks like:
         at_wini(73130): panic: sigaction failed: 0
         syslib:panic.c: stacktrace: 0x74dc 0x2025 0x100a
   - throws out report() - printf() is more convenient and powerful
   - harmonizes/fixes the use of panic() - there were a few places
     that used printf-style formatting (didn't work) and newlines
     (messes up the formatting) in panic()
   - throws out a few per-server panic() functions
   - cleans up a tie-in of tty with panic()

merging printf() and panic() statements to be done incrementally.

lib/libsys/timing.c

@@ -22,7 +22,7 @@ void util_timer_start(util_timingdata_t *timingdata, char *name)
 	}
 
 	if (timingdata->starttimes[HIGHCOUNT]) {
-		panic(__FILE__, "restart timer?", NO_NUM);
+		panic("restart timer?");
 		return;
 	}
 
@@ -37,7 +37,7 @@ void util_timer_end(util_timingdata_t *timingdata)
 
 	read_tsc(&h, &l);
 	if (!timingdata->starttimes[HIGHCOUNT]) {
-		panic(__FILE__, "timer stopped but not started", NO_NUM);
+		panic("timer stopped but not started");
 		return;
 	}
 	if (timingdata->starttimes[HIGHCOUNT] == h) {
@@ -73,7 +73,7 @@ void util_timer_end(util_timingdata_t *timingdata)
 		timingdata->binsize;
 	if (bin < 0 || bin >= TIMING_POINTS) {
 		/* not serious, but can't happen, so shouldn't */
-		panic(__FILE__, "bin out of range", bin);
+		panic("bin out of range: %d", bin);
 	} else {
 		timingdata->lock_timings[bin]++;
 		timingdata->measurements++;