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Configuration format change
Previously the values for configuration entries with the key `tags`
were interpreted as a whitespace delimited list of strings. As of
commit e4ec3ced16cc90c3e9c738630bf0151699c4c087 those entries are
split at semicolons (';').
This changes the semantic of the configuration file and affects
everyone who uses filter rules that set or remove more than one tag
at once. Please inspect your configuration files and adjust them if
necessary.