* * *
Fix xUNIT output
* * *
Fix xUNIT output

Added support PPI (Per-Packet Information) header. Decoding is partial but sufficient to reach next layer.

The Field's default object used to be shared along instances of the Field, ie.:

>>> class A(Packet):
...     fields_desc = [IntField('i', None)]
...
>>> class B(Packet):
...     fields_desc = [PacketListField('a', [], A)]
...
>>> B().a is B().a
True

Fix it, so:
>>> B().a is B().a
False

Newer versions of the pypcap library now include our fixes
and support the timeout_ms argument. So we should not depend
on our customized, specially marked, pypcap version anymore.

Field size was changed from 2 to 6 bytes, according to the RFC.
http://tools.ietf.org/html/rfc2461#page-31

Packet.build() is called only on the first layer. It will call
Packet.do_build() which will recurse through all layers. For each layer,
it will call Packet.self_build() which will do the job for each layer.
Packet.do_build() will call Packet.post_build() and transform on them,
and concatenate them. Then Packet.build() will call Packet.build_padding()
and Packet.build_done().

Note that this undetermined case will have a different behavior:
Raw("ABC")/Padding("abc")/Raw("DEF")/Padding("def")

It was "ABCabcDEFdef"
Now it is "ABCDEFabcdef"

PyCrypto 2.0.1 caused deprecation warnings on Python 2.6,
because it used sha and md5 modules, which were replaced
by hashlib in Python 2.5.

Indentation was sometimes done with spaces and sometimes
with tabs, which was irritating if your editor had a
different tabsize configured than 8 spaces.

This was left-over from the old console handling
code in Scapy-win. Now this caused a NameError:
"global name 'console' is not defined"

With IPython support enabled, any command line arguments
given to Scapy were incorrectly interpreted by the embedded
IPython shell as IPython command line arguments.
For example, "scapy -d" (to increase Scapy's debug level) did not work.

Add the following line to ~/.scapy_startup.py :
conf.interactive_shell="ipython