big-endian systems properly yet -- need to add RIFX support or swap
samples while writing. more on this coming soon.
- new "-F <format>" option for audiorecord. supported values of <format>
are "sun", "wav" and "none", plus a few aliases.
- split sun & wav support out into their own files.
- don't assume that WAV header elements are properly aligned for the
type of data they hold.
XXX: still need to clean up libaudio interfaces a lot.
mrg