Fix pcomn::subnet_address, add subnet_address::raw,  sock_address::raw
colosed_hashtable::value_count(), subnet_address::addr_range(), inet_address::next()
Make CppUnit::assertion_traits<> for containers/tuples to use CppUnit::assertion_traits for value/member types
Enable max load factor specification in pcomn::closed_hashtable constructor

Fix initsize specifiaction: negative initsize in constructor call specifies initsize 0