Rename file_stream.h -> uncompressed_stream.h
Rename tpie::file_stream -> tpie::uncompressed_stream
Add file_stream.h (just includes compressed/stream.h).
compressed/stream.h: Rename tpie::compressed_stream -> tpie::file_stream.
ut-compressed_stream: Rename tpie::compressed_stream -> tpie::file_stream.
Change default compressionFlags to compression_none.
Rename stream.h -> stream_old.h
Rename tpie::stream -> tpie::stream_old.
Rename cstream.h -> stream.h
Rename tpie::cstream -> tpie::stream
tpie/stream.h: Change compressed_stream -> file_stream.
Fix file_stream/compressed_stream/stream/cstream uses.
Make file_stream::beginning/end/current public.