pack: support numbered format strings.
pack: add some tests for expand-pack-format.
io.streams.byte-array: faster M\ byte-reader stream-read-unsafe.
io.streams.string: faster M\ string-reader stream-readln.
io.streams.sequence: bounds check sequence-read-until.
io.streams.sequence: rename (stream-seek) to sequence-seek.
io.streams.byte-array: faster with-byte-writer.
io.streams.sequence: cleanup by moving type checks.
io: minor cleanups.
io.streams.sequence: use member? to support bignum separators.
checksums.xxhash: adding xxHash checksum implementation.
checksums.murmur: remove code duplication.
checksums.md5: remove extra "32 bits".
random: simplify using bitwise operations.
checksums.xxhash: cleanup, faster.
checksums.internet: simplify.
sequences.extras: adding replicate-into.
io.files.info.unix.linux: cleanup stack effects.
calendar.unix: simplify current-timeval.