[Mldonkey-users] udp trackers support

[ygrek]

Hello,

Attached is the patch for udp trackers support (BEP 15).
It may cause (easily solvable) merge conflicts with my previous patches.
It is intended for testing and is not 100% polished, some issues are outlined 
below :
 - depends on bitstring ocaml library
 - the above dependency is hardcoded into Makefile and relies on ocamlfind (see 
BITSTRING_DIR)
 - http trackers are disabled (to simplify testing)
 - uses ugly resume_clients_hook to solve circular dependency
 - tracker address resolution is synchronous (blocking)
 - verbose logging (grep udpt)

-- 
 ygrek
 http://ygrek.org.ua/

udpt1.diff
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