Allow resume detection
It is alive... again!
According to the docs, "While one thread is blocked in a call to epoll_wait(), it is possible for another thread to add a file descriptor to the waited-upon epoll instance.  If the new file descriptor becomes ready, it will cause the epoll_wait() call to unblock."
Speed up tests a little
Fix NPE in clone
Release channels on close, with optional safe GC
Terminate channel properly