BAT release, version 1.0.0

This release is the result of a major clean up of the code and build
system. This allowed us to implement important new features but
implied that we had to break compatibility with previous releases. We
removed many inconsistencies in the interface and intend to not do any
such changes in future versions 1.X of BAT. To ease the maintenance
burden, we also removed some parts of the code that felt were untested
and not easy to keep up to date.