- write classes/functions
- support XML and legacy build.ini (warn to STDERR for build.ini)


BUGS.SQUARE-R00T.NET bugs/tasks:
#7:  Ensure conditional deps/imports for features only if used.
     Is this setup.py-compatible?
#14: Use os.path.join() for more consistency/pythonicness
#24: Run as regular user? (pychroot? fakeroot?)
#34: Build-time support for only building single phase of build
#36: Allow parsing pkg lists with inline comments
#39: Fix UEFI
#40: ISO overlay (to add e.g. memtest86+ to final ISO)
#43: Support resuming partial tarball downloads (Accet-Ranges: bytes)