Store version info for this BE installation.
By default, use the Git-generated information in _version, but allow manual overriding by setting libbe.version._VERSION. This allows support of both the “I don’t want to be bothered setting version strings” and the “I want complete control over the version strings” workflows.
Returns the version string for this BE installation. If verbose==True, the string will include extra lines with more detail (e.g. last committer’s name, etc.).