All locks are currenly held from only a single thread (the IOThread)
and thus we don't need the Mutex.

Not used anymore because NfsManager now uses boost::intrusive::set
instead of std::map.

Reduce overhead for storing the key twice, and more overhead while
looking up the connection to remove it after a failure.

This allows eliminating the indirection code from the NfsConnection
destructor.

It's just a useless wrapper for class NfsManager.

Reduce Remove() overhead because we don't have to walk the list to
find an iterator by reference.

Since BroadcastError() calls BroadcastMountError(), there's no need to
check mount_finished here.

While reconnecting to the NFS server, the socket is -1, because there
is no socket.  Fixes a potential crash (assertion failure).

Necessary for "final" on gcc 4.6.

Generate more detailed error messages.

Eliminate duplicate definition (in input plugin and decoder plugin).

Again, POSIX says strcasecmp is not in string.h.

std::map::emplace() is only available from gcc 4.8 on.

More robust and cancellable.

Make valgrind happy.

Turns out ucol_getSortKey() does not what I thought it does.

Fixes the broken "search" command.

Fixes crash after database update.

Fixes initialization failure.

libsmbclient is not thread-safe nor reentrant.  We must protect all
function calls with a global mutex, unfortunately.

Eliminate class LibUPnP and move the code to ClientInit.cxx.  Its
initialization function can be called multiple times, but
UpnpRegisterClient() is called at most once.

Allow calling UpnpGlobalInit() multiple times.