SEEK_SET is defined by unistd.h.  Explicitly include it.

The music pipe audio format bugs seem to be fixed (hopefully).
Disable music_pipe_check_format() for now, since it consumes a lot of
CPU cycles.

Added $(DOCBOOK_FILES) to $(EXTRA_DIST).  Don't include the generated
protocol.html in the tarball.

Renamed the local variable "basename", which shadows the POSIX
function basename().

Since we don't use libtool anymore, autogen.sh shouldn't call libtoolize.

We shouldn't pass strerror() where a format string is expected.

assert_static() will help us to find false asserts in compile time. Of
course it only works in case of expressions which can be evaluated
compile time. It cannot be used in global scope.

The client may provide the names of idle events as arguments to the
"idle" command to inform MPD that it is only interested in these
events.

Refuse to play audio formats which are not supported by MPD.

Pushing buffers with a zero length into the MPD core causes failures;
don't let them pass beyond the decoder plugi API.

Removed the superfluous my_usleep() call.

When MPD quits in a non-clean way, the state file isn't written, and
on the next start, MPD time warps to the previous clean shutdown.
Save the state file every 5 minutes; this will probably be
configurable at a later time.

Note that we don't set a wakeup timer for that: when there is no MPD
traffic, MPD won't wake up to save the state file.  This minor bug is
tolerated, because usually there is no change in MPD's state when the
main thread is idle.

If the caller attempts to seek only a few bytes forward, chances are
good that the offset is already in the buffer.  In this case, simply
fast-forward the buffer.

Added some assertions.

If someone calls seek() with an invalid (negative) offset, the curl
implementation of that method returned false, but left this invalid
offset in input_stream.offset.  Move the calculation to a temporary
variable.

Over the years, a lot of commands have been added to MPD which were
documented only in the wiki
(http://mpd.wikia.com/wiki/Protocol_Reference).  Merge all missing
commands from there.

Correct lots of grammar and spelling errors.  Unify some phrases.

Wrapped keywords in DocBook tags where appropriate.

While waiting for the input stream to become ready, ignore all
commands except STOP.  This fixes seeking errors with (remote) songs
which the decoder has already finished.