the old lib/allocators.h is now a bridge to the new headers (temporary)
make slight interface changes in lib/res/file to match new allocators
interface
This was SVN commit r5445.
archive_builder: move logic into a Compressor functor. avoid direct
dependency on ZLib
compression: add provision for calculating checksum
Xeromyces: remove no longer needed zlib.h
This was SVN commit r5388.