Numerous vorbisfile fixes:
Fixed a seek bug that didn't cause any wrong answers but did have a
minor negative impact on seeking performance
Corrected ov_read_float() prototype ot more closely match how
ov_read() is used.
Rendered all of vorbisfile 64 bit clean for >2GB files. This required
changing ov_seek_raw(OggVorbis_File *vf,long position) to
ov_seek_raw(OggVorbis_File *vf,ogg_int64_t position). This breaks lib
compatability for those using this function, please increment the
version number.
Fixed vorbisfile handling of logical streams that begin at a non-zero
PCM offset. captured live streams, and cut streams, for example, now
behave.
svn path=/trunk/vorbis/; revision=3126