Moved all generated files to gen sub directory.
Renamed some generated files.

Added destructor which decrements reference count on any referenced object.

Made niflib more verbose: prints blocks as it reads the NIF file (helps identifying buggy blocks); fixed output of bytes.

Fixed something I broke on last commit + another update to XML in ByteArray: niflyze now reads Oblivion files :-)

Updated SConstruct.

Reversed local variable declaration order: this fixes an issue with calculating array sizes where one size depends on the size of another.