Make the __repr__ of IpAddress instances more human-readable.

[exhuma]

Currently the representation of the IpAddress type contains a byte-string. Converting the byte-string to an ip-address would make log output much more readable.

The following line would break the API with the superclass Type:

IpAddress('192.168.1.1')

becuase the superclass requires a bytes object as argument. The following would keep a consistent API but would make output quite long:

IpAddress.from_string('192.168.1.1')

Alternatively a non-executable form may be used:

<IpAddress 192.168.1.1>