Bit manipulation for integers

A uniform interface to OpenFlow 1.0 and 1.3.

The first fields of every OpenFlow message, no matter what the version, have the same shape. This is unlikely to change in subsequent OpenFlow versions because there needs to be some standard way to determine the version of each message. So we define that here.

Library for constructing, marshaling and parsing data packets. These packets are independent of OpenFlow message information - they are mostly used for the payloads of PacketIn and PacketOut messages.

Utility functions for Frenetic_kernel. These are used in multiple modules and don't have an obvious home type.