Add OrbitUtils to avoid circular dependencies

Master.hs

 --
 -- orbit-int master (controlling orbit computation)
 --
-module Master (now) where
+module Master () where
 
--- current wall clock time (in milliseconds since start of RTS)
--- FIXME get current wall clock time
-now :: Int
-now = 42

OrbitUtils.hs

+--
+-- orbit-int orbitutils 
+--
+module OrbitUtils (now) where
+
+-- current wall clock time (in milliseconds since start of RTS)
+-- FIXME get current wall clock time
+now :: Int
+now = 42

Sequential.hs

@@ -6,7 +6,7 @@ module Sequential(orbit) where
 import Table (Freq, VTable, Vertex, get_freq, freq_to_stat, is_member, insert, new, to_list)
 import Data.Hashable (hash)
 import Data.Dequeue (BankersDequeue, fromList, popFront, pushBack)
-import Master (now)
+import OrbitUtils (now)
 
 type Conf = ([Vertex -> Vertex], Int)