* timeout clarifications (negative values are no longer accepted, use nil instead)
* linda(send, linda.null, key, ...) removed, if you want to send a nil, just do it as usual
win32 pthread support is gone
new setting configure.shutdown_mode for cancellation of free-running threads at shutdown.
no more hard thread termination! If a thread doesn't cooperate, an error is raised.
lane.status "killed" is gone
lane:cancel can't force-kill.