- update to version 3.6.0
  * libcw no longer uses signals (and SIGALRM in particular) for any
    internal purpose. Internal communication between generator and
    queue has been re-implemented using other mechanism:
    pthread_cond_wait() and pthread_cond_broadcast().
  * in relation to the above, in order to avoid calling of
    pthread_cond_wait() and pthread_cond_broadcast() in signal
    handlers, the SIG_IGN and SIG_DFL values registered with
    cw_register_signal_handler() are completely ignored. It is
    strongly advised to avoid any libcw cleanup or calls to exit() in
    signal handlers (registered with either with
    cw_register_signal_handler() or with more direct methods).
  * enabling ALSA's configuration of HW period size.
  * ALSA period size (in samples) used by applications (cw, cwcp,
    xcwcp) can be specified in command line through --alsa-period-size
    command line arg.
  * modifying PulseAudio parameters to decrease XRUNS and improve
    behaviour of callback registered by client code in library.
  * Behaviour of cw_lookup_phonetic() library function has been modified: the
    function now accepts NULL as a second argument (output buffer).
  * Several items in libcw_debug.h are marked as deprecated. These items
    should be used only internally, during development of libcw, and should
    not be used by client code. They will be removed from the header in the
    future.
  * Declaration of cw_debug_print_flags() has been removed from libcw_debug.h
    header. The function was not defined in the library, so no one could have
    used the function.
  * Function cw_generator_set_tone_slope() from libcw.h is now marked as
    deprecated. The function was/is unusable because there is no way that
    client code can pass a cw_gen_t variable as first argument.
  * Replacing some usages of double type with float type. There is very
    little (or maybe even nothing) in the library that would require
    precision or range of double.
  * Adding new function: cw_generator_remove_last_character().  The function
    removes last character enqueued to generator, it can be called multiple
    times to remove a group of characters. The function can be used e.g. in
    reaction to Backspace character pressed in User Interface.
  * modifications to receiver functions:
    cw_receive_character(), cw_receive_representation(),
    cw_start_receive_tone() and cw_end_receive_tone() are now actually
    setting errno to EINVAL (as described in documentation) when they detect
    that input timestamp (when the timestamp is non-NULL) is in some way
    invalid.
    cw_receive_buffer_dot() and cw_receive_buffer_dash() set additional value
    of errno (EINVAL) when they detect that input timestamp (when the
    timestamp is non-NULL) is in some way invalid.
  * cw_wait_for_tone_queue_critical() now sets errno to EINVAL and returns
    CW_FAILURE if function's argument is negative.
  * there is a hard limit on length of name of sound device: 127
    characters (+1 for terminating NUL).
  * library soname/version changed from 6.6.1 to 7.0.0.
- xcwcp:
  * program's command line option "--sound" has been changed to
    "--system", for consistency with similar option in other unixcw
    programs.

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