Insert DER test data inside x509.uts and move it from scapy/layers/ to test/ (also, remove obsolete X.509 tests from test/regression.uts

Heavy modifications to x509.py : comprehensive support for many more fields, extensions and keys (both RSA and ECDSA)

Heavy modifications to asn1fields.py : proper and exhaustive support for ASN1 objects as fields (SEQUENCE, CHOICE, _optional, etc.)

Add implicit/explicit tagging support ; add high-tag number support ; add more proper BER bit string encoding/decoding

Implement a binrepr() function working with both Python 2.5 and 2.6+

Implementation of IPv6 ND attacks described in RFC 3756

various IPv6 Neighbor Discovery attacks referenced in RFC 3756 (IPv6
Neighbor Discovery (ND) Trust Models and Threats). Integration work in
recent version and associated tests done by Guillaume!

Fix Net6.__repr__()

0b0000 is not supported in Python 2.5

TCP: support flag Nonce Sum (N)

LLTD: remove class decorators (not supported by Python 2.5)

Fix proposed by @fredonner. Closes #59.

Improve LLTD layer

Add support for Modbus TCP protocol

Packet().overload_fields can be overwritten

As suggested by @guedou, this adds tests for fragment() and
defragment() functions.

This is needed by fragment(), which has been broken since PR #11.

Added AEAD digest support to IPSec layer, specifically for GCM and CC…

Add contributing guidelines

TracerouteResult.world_trace() now uses Matplotlib Basemap Toolkit