Explicitly initialize members of fundamental types; avoids "jump depends on
uninitialized value"-warnings by valgrind.
reduce MIN_CORE_FILEDESCRIPTORS again, now that we have a single leveldb for all torrents.
MIN_CORE_FILEDESCRIPTORS can't be much higher because it will limit nMaxConnections.
refresh mention resource in dht
Merge pull request #71 from s9h869e5k5/fix-valgrind-warnings

Avoid valgrind warning.