ng_patch node

[Maxim Ignatenko]

Extended and improved version of ng_patch node:
1) added new operations ('*', '/', unary '-', '<<', '>>')
2) single node now able to apply arbitrary number of changes
3) m_pullup replaced with m_copydata/m_copyback
4) ntoh/hton used to apply changes correctly
5) checksum handling
6) added some stats
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