HUGE refactor, creating lots of modules, no code changes though!

src/order.py

@@ -0,0 +1,34 @@
+from enum import Enum
+
+
+class Order(Enum):
+    FromTo = 0
+    ToFrom = 1
+    Any = 2
+
+    @staticmethod
+    def new(order):
+        if order is None:
+            return Order.Any
+        elif order == "to-from":
+            return Order.ToFrom
+        elif order == "from-to":
+            return Order.FromTo
+        else:
+            raise NotImplementedError("What kind of ordering is: {}".format(order))
+
+
+    def match(self, from_w, to_w):
+        if self is Order.Any:
+            return True
+
+        fi = from_w.int_id
+        ti = to_w.int_id
+
+        if self is Order.FromTo:
+            return fi < ti
+        elif self is Order.ToFrom:
+            return ti < fi
+        else:
+            raise NotImplementedError("Should not be here: Order match")
+