Syck

64-bit compatibility and major cleanup.

In this release, the final changes to libsyck API have now
been made. The Ruby extension now passes all of its original
tests for loading and dumping. The new YAML::Tag
mechanism is functional.

A rewritten YAML generator that increases output speed by a factor of four, simplified custom types in the Ruby extension, unit tests for the core library, and fixes for many memory leaks.

Better handling of DOS line endings, fixes for buffer
overflows in the emitter, and sexagecimal ints.

This version fixes a buffering problem when certain types
of scalar nodes exceed the default buffer size, and
includes small fixes to bytecode parsing.