16-bit SoundBuffer

Hi All,

    I'm looking for debugging help as I don't have time to look at this.  Here's a change set that renames SoundBuffer to OldSOundBuffer and introduces an equivalent replacement that uses the native 16-bit format Spur supports, and hence provides faster access via jitted at: & at:put: primitives.  Things seem to work except the one sound test that fails in writing the data to a file.  If you have time or energy please take a look.

AdvThanksance