svn path=/trunk/vorbis/; revision=15737
* Improved robustness with corrupt streams.
* New ov_read_filter() vorbisfile call allows filtering decoded
audio as floats before converting to integer samples.
+ * Fix an encoder bug with multichannel streams.
* Replaced RTP payload format draft with RFC 5215.
* Bare bones self test under 'make check'.
* Fix a problem encoding some streams between 14 and 28 kHz.