repoze.evolution 0.3

Remove unncessary assignment.

repoze.evolution no longer attempts to construe implicitly the version of a database for which no version has been set explicitly. Previously, an unversioned database was construed to already be at the software version. The ZODBEvolutionManager performed a write on read, setting the database version to the software when get_db_version() was called. The constructor for ZODBEvolutionManager now accepts an optional argument, initial_db_version, which specificies the version a database should be considered to be if it does not already have a version set. The default value is None. If a database has not already been marked to be at a particular version, get_db_version() will return the initial database version value. If this is None, attempts to call evolve_to_latest() will fail with a ValueError. This represents a backwards incompatible change, as databases for which no initial version is supplied explicitly will now fail to evolve.

Added new public method, set_db_version() to IEvolutionManager interface.

100% test coverage.

Initial release.