This uses a new query-server command for running multiple queries, so
that a single evaluator log will be produced for the entire run.

To avoid too much code duplication, I have updated a lot of the code
paths involved in running local queries to work with multiple query
paths. This also required some refactoring to explicitly associate an output basename (used to
produce the .bqrs, .csv, etc. paths) with each query, where before those output filenames were
hard-coded.

Add command for running a query suite