Add forgotten copyright notice, found by Jason Thorpe <thorpej at me.com>.
Thanks!

Don't remove the type component from the device string before passing
it to the *_open() functions. It's more flexible this way. No behaviour
change.

Prefix by '_' symbols that are not part of the API.

ok deraadt, guenther

Use dedicated messages for flow control instead of abusing clock tick
messages and enable flow control for MIDI. Since this requires protocol
version bump, both sndiod and libsndio must be kept up to date to work
together.

Add a "device number" component in sndio(7) device names, allowing a
single aucat instance to handle all audio and MIDI services. Since
this partially breaks compatibility, this is a opportunitiy to fix few
other design mistakes (eg ':' being used by inet6, type name vs api
name confusion, etc..). This leads to the following names:

type[@hostname][,unit]/devnum[.option]

The device number is the minor device number for direct hardware
access (ie the 'N' in /dev/audioN). For aucat, this is the occurence
number of the -f (or -M) option.

There's a compatibility hook to keep old names working if only one
aucat server is running.

Remove midicat since aucat can now be used instead of midicat
with almost the same syntax (roughly an extra -M option).
Thru boxes are created with aucat, and corresponding MIDI port
names have the "aucat" prefix instead of "midithru". The old
device name will still work some time for backward compatibility.

ok deraadt

slightly cleanup by separating socket-specific code from
protocol specific code. No behaviour change

Make aucat audio and midi backends share the same code to communicate
with the server. As we're at it use the same protocol for midi and
audio. Now, both audio and midi code use the same SNDIO_DEBUG environment
variable to turn on/off DPRINTF's.

Don't remove the type component from the device string before passing
it to the *_open() functions. It's more flexible this way. No behaviour
change.

Prefix by '_' symbols that are not part of the API.

ok deraadt, guenther

Use dedicated messages for flow control instead of abusing clock tick
messages and enable flow control for MIDI. Since this requires protocol
version bump, both sndiod and libsndio must be kept up to date to work
together.

Add a "device number" component in sndio(7) device names, allowing a
single aucat instance to handle all audio and MIDI services. Since
this partially breaks compatibility, this is a opportunitiy to fix few
other design mistakes (eg ':' being used by inet6, type name vs api
name confusion, etc..). This leads to the following names:

type[@hostname][,unit]/devnum[.option]

The device number is the minor device number for direct hardware
access (ie the 'N' in /dev/audioN). For aucat, this is the occurence
number of the -f (or -M) option.

There's a compatibility hook to keep old names working if only one
aucat server is running.

Remove midicat since aucat can now be used instead of midicat
with almost the same syntax (roughly an extra -M option).
Thru boxes are created with aucat, and corresponding MIDI port
names have the "aucat" prefix instead of "midithru". The old
device name will still work some time for backward compatibility.

ok deraadt

slightly cleanup by separating socket-specific code from
protocol specific code. No behaviour change

Make aucat audio and midi backends share the same code to communicate
with the server. As we're at it use the same protocol for midi and
audio. Now, both audio and midi code use the same SNDIO_DEBUG environment
variable to turn on/off DPRINTF's.