Add 'Time' as a parameter type that can accept various

formats for time (strings, datetime objects, etc.)
Advance system time to 1/1/2009
Clean up time management code a little bit

--HG--
extra : convert_revision : 28ebecc7ea6b12f4345c77a9a6b4bdf2e752c4f8

src/python/m5/objects/Tsunami.py

@@ -13,8 +13,8 @@ class TsunamiCChip(BasicPioDevice):
 
 class TsunamiIO(BasicPioDevice):
     type = 'TsunamiIO'
-    time = Param.UInt64(1136073600,
-        "System time to use (0 for actual time, default is 1/1/06)")
+    time = Param.Time('01/01/2009',
+        "System time to use ('Now' for actual time)")
     tsunami = Param.Tsunami(Parent.any, "Tsunami")
     frequency = Param.Frequency('1024Hz', "frequency of interrupts")