Features:
 * Internal workings more in line with other Jack drivers.
 * Use poll() for wait and sync instead of blocking I/O.
 * Allows to use Jack in "async" mode.
 * Calculate DSP usage correctly.
 * OSS buffer management to achieve stable latencies.
 * Latency correction for asymmetric OSS buffer use.
 * More robust handling of over- and underruns.
 * Handle format changes forced by the OSS interface.
 * FreeBSD 24bit samples are always packed.

No changes to the driver parameters or the user interface.