Pynetfilter-conntrack

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* New classes for EXPECT manipulation, Expect and ExpectEntry
* Remove Conntrack.destroy_conntrack(), replaced by ConntrackEntry.destroy()
* ConntrackEntry IP (v4 and v6) attributes are now IPy.IP objects
* Remove hashtuple attribute from ConntrackEntry
* BUGFIX: Don't convert endian (ntohl) when reading entry.status value
* Write cnetfilter_conntrack: Python binding of the
libnetfilter_conntrack library written in C

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* Fix ConntrackEntry._getAttr() for Python 2.3

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* Fix ConntrackEntry.hashtuple for layer3 different than IPv4 and IPV6
* Use correct bitmask with ntohs() in ConntrackEntry._getAttr()

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* Rewrite from scratch for new libnetfilter_conntrack

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* Add debian/ subdirectory for Debian and Ubuntu packaging

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* Compliance with 'pickle'
* Minor enhancements in API