Add bit-wise operators for IP-addresses

[mpolk]

Add bit-wise operators ("&", "|" and "~") for the IP-addresses.

The ability to perform bit-wise operations on IP addresses and masks seems highly desirable for manipulating network traffic data during investigations of various network incidents. The lack of bit-wise operations and the resulting need for external scripts creates significant inconvenience, so the proposed addition seems quite useful.

The only drawback of the proposed solution appears to be the inability to meaningfully interpret binary bit-wise operations on the network mask. In this implementation, the mask of the first operand is arbitrarily copied into the result. This violates the commutativity of operations, but this sacrifice of purity for ease of manipulation does not seem particularly significant.