* Don't put the device in non-blocking mode at open() time; this makes

  it impossible to access blocking mode!

* Rename write() to writeall(), and add a write() method that just
  does one write().

* Rearrange/simplify writeall(): in particular, don't supply a timeout
  to select().  Let it block forever if it has to.

* Add a bunch of simple ioctl() wrappers: nonblock(), setfmt(),
  getfmts(), channels(), speed(), sync(), reset(), post().  These
  wrap, respectively, SNDCTL_DSP_NONBLOCK, SNDCTL_DSP_SETFMT,
  SNDCTL_DSP_GETFMTS, etc.

* Reduce flush() (which was a wrapper for the SNDCTL_DSP_SYNC ioctl) to
  an alias for sync().

* Rearrange the lad_methods list to reflect the order in which the
  methods are defined, and add some grouping comments.

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