Use a more compact +RTS -s output for Tasks

                        MUT time (elapsed)       GC time  (elapsed)
  Task  0 (worker) :    0.00s    (  0.00s)       0.00s    (  0.00s)
  Task  1 (worker) :    0.00s    (  0.01s)       0.00s    (  0.00s)
  Task  2 (worker) :    0.00s    (  0.03s)       0.00s    (  0.00s)
  Task  3 (bound)  :    0.00s    (  0.00s)       0.02s    (  0.04s)

rts/Stats.c

@@ -628,11 +628,11 @@ stat_exit(int alloc)
 	    {
 		nat i;
 		Task *task;
+                statsPrintf("                        MUT time (elapsed)       GC time  (elapsed)\n");
 		for (i = 0, task = all_tasks; 
 		     task != NULL; 
 		     i++, task = task->all_link) {
-		    statsPrintf("  Task %2d %-8s :  MUT time: %6.2fs  (%6.2fs elapsed)\n"
-			    "                      GC  time: %6.2fs  (%6.2fs elapsed)\n\n", 
+		    statsPrintf("  Task %2d %-8s :  %6.2fs    (%6.2fs)     %6.2fs    (%6.2fs)\n",
 				i,
 				(task->tso == NULL) ? "(worker)" : "(bound)",
 				TICK_TO_DBL(task->mut_time),
@@ -642,6 +642,8 @@ stat_exit(int alloc)
 		}
 	    }
 
+	    statsPrintf("\n");
+
             {
                 nat i;
                 lnat sparks_created   = 0;