Update scripts to call python2 instead of python

Update ls() to display more info about enum fields

Packet.getlayer() method can work with string layer name

add TCP User Timeout Option (RFC 5482)

Allow one to send the TCP User Timeout Option described in RFC 5482 in
a crafted TCP segment.
Also added unit tests in new "TCP options" section of
test/regression.uts

Allow L2pcapListenSocket to return None if where is no packets (issue #74)

Allow the use of file-like objects with wrpcap() (and (Raw)PcapWriter())

IKEv2: fix fields overload (fixes #79)

Allow one to send the TCP User Timeout Option described in RFC 5482 in
a crafted TCP segment.

Allow L2pcapListenSocket.recv() to return None if where is no captured packets. Make sniff() to continue loop if received pkt is None (issue #74)

Move the Pcap/PcapNg detection from rdpcap to (Raw)PcapReader

Remove unneeded tests

Reported by Aaron Wood on Scapy ML.

This does not change the use of rdpcap() with both formats, and allows
using (Raw)PcapReader() against a PcapNg files.

Multiple ASN.1 enhancements ; X.509 comprehensive support