Rev477, FindHashId command for optional files, Renaming some variables to make it more clear, Optional files downloading in WorkerManager, Test FindHash, Test Optional download, Test FindOptional

src/Config.py

@@ -8,7 +8,7 @@ class Config(object):
 
     def __init__(self, argv):
         self.version = "0.3.2"
-        self.rev = 473
+        self.rev = 477
         self.argv = argv
         self.action = None
         self.createParser()