Imported core, m, ag and serial for refactoring

ag/ag.Module.pyx

@@ -0,0 +1,20 @@
+cdef class Module:
+	def __init__(self, name, provides=set(), requires=set(), common=set()):
+		"""
+		* Modules are identified by their name which has to be unique within the Aggregate's namespace.
+		* The provides sequence contains keywords which are copied into Aggregate's _provided list.
+		  Two modules providing the same export can't be linked into the same Aggregate.
+		* The requires sequence contains keywords that have to be already present in the Aggregate's
+		  _provided list before linking.
+		* All names in the Module's namespace that don't begin with an underscore will be exported
+		  into the Aggregate's namespace.
+		* If you want to call one method on multiple modules, these modules must all export the method name
+		  in their "common" set. Otherwise a name collision is raised. Their methods will be called in the
+		  same order in which the modules were linked.
+		"""
+		
+		self._top = None
+		self._name = name
+		self._provides = set(provides)
+		self._requires = set(requires)
+		self._common = set(common)