update changelog.rst

insert an empty line

fix version in changelog

util/winvbox.py: try each bdist_ command separately in case one of th…

…e fails

update changelog.rst

update README.rst

make_dist.py: pass version as an argument rather than an option

add changelog entry for 1.0a3 (unformatted)

include util/ and Makefile.ext into release tarball

set version to 1.0a1