Optimization for PositionalBufferedStream with specialized read(byte, int, int) method
-- For binary codecs having an efficient reader of lots of bytes that doesn't fall back into read() itself vastly improves performance. The old version was 10x slower than InputStream, while the new version is +30%.
-- Generalize PositionalBufferedStream main() method for performance testing, now accepts cmdline arguments for the file to read, how many iterations, etc
Generalize AsciiLineReader main() method for performance testing
-- Now accepts cmdline arguments for the file to read, how many iterations, etc
AsciiLineReaderTest and PositionBufferedStreamTest were in src not test/src
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