Pyabc

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* Add batch sampling now also to the REDIS evaluation parallel sampler
(dynamic scheduling)

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* Bug fix. Fix a race condition in the redis evaluation parallel sampler
(dynamic scheduling). An error occured if a worker tried to start to work
on a population after the other workers had already terminated the
population.

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* Minor bug fix. Ensure that the multicore samplers raise an Exception if
an Exception occurs in the worker processes.
* Clarify that weighted distances are not normalized in case of having more
than a single simulation per proposed parameter.
Also add corresponding tests.
* Add n_worker method to the RedisEvalParallelSampler to enable querying of
the number of connected workers.
* Add in-memory database support. Useful, e.g., for benchmarking on slow
filesystems or with rather slow network connections.

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Make git and gitpython an optional dependency.

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* Add "abc-redis-manager reset-workers" command in case workers were
unexpectedly killed.
* Adapt web server to changed bkcharts API.

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* Bug fix. Rand seed initialization in case of starting multiple workers
with --processes in redis server was not correct.