IGMPv3 proxy implementation
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This is an implementation of an IGMPv3 proxy. It's conform
to the IGMPv3 proxying internet draft:<draft-ietf-idmr-igmp-v3-07.txt>. 
The "gproxy" daemon maintains the IGMP table as described in the draft. 
The config file "$(IGMP_PROXY_DIR)/etc/igmprt.conf" contains 
the following configuration options:
- Upstream interface: The upstream interface of the IGMPv3 proxy. 
- IGMP_Version      : IGMP version used by the deamon.
- Is_querier        : not used.

TODO:
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* The multicast router behavior in the presence of older version group members
  (section : 7.3.2).
* Configure timers from the config file.
* Detect other querier.

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Authors: Lahmadi.Abdelkader@loria.fr
