Km3pipe

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* ``tohdf5`` can now convert multiple files in one shot (again). There is no
merging anymore, this will be done by ``h5concat`` in future.
* ``runtable`` now accepts ranges of runs ``-r FROM_RUN-TO_RUN``
* fixes a bug in ``tohdf5`` where the default output filename is ``dump.h5``
now it's original filename + .h5 if no output filename is specified
* Adds ``HDF5Header`` which is a convenient way to access the ``/raw_header``
data from ``KM3HDF5`` formatted files.
It can be used like ``header = km3pipe.io.hdf5.HDF5Header.from_hdf5(filename)``

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* prettier `Blob` when printed
* KM3HDF5 v5.1 - introducing a new raw_header definition to store file/MC info
* Read only aanet data when passing ``bare=True`` to ``kp.io.aanet.AanetPump``
* AA: If ``rec_type`` (defined in JFitApplications.hh) is not available, use the
JHistory ( ``rec_stages`` ) to derive the fit name, like ``jhist__jgandalf__jprefit``
* AA: If neither ``rec_type`` nor history are available, enumerate track names
names ``generic_track_``, based on their dtype.
* AA: more robust track readout (segfaults etc form looping over empty pyroot
vectors

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* tohdf5.py: - adds a time conversion from mc time to jte time.
* `kp.shell.Script` now implements addition, so you can concatenate multiple
scripts together

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* minor fixes

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* Fix a new typo in `stats.rv_kde.rvs`

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* Fix a Python 2.7 syntax error (`self. print`)