Km3pipe

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* ``HDF5Sink`` now uses the new ``HDF5MetaData`` class two write more verbose
metadata to the files (e.g. file conversion parameters)
HDF5 metadata now contains much more information; e.g. if the mc hit time
correction was applied, the aa-format, whether jppy was used etc
* introduce "services" to the pipeline model. these are addressed via the
``expose`` method
* aa/gand: fix up-vs-downgoing normalisation (now difference over sum)
* fix automatic JTE/MC time conversion
* fix the check if mc time correction needs to be applied
* ``h5tree`` CLI util, to print just the structure + nevents + nrows.
less verbose than ``ptdump``
* KM3HDF5 4.3: introduce richer metadata

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* Option to Ignore hits in pumps
* fix aanet fitinf enum

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* fix aanet (optional) 4-element event.weight vector readout. the weights
can now be read again :-)
* Use mc_t to detect if MC time conversion (from JTE to MC time) should be
applied. Should be more reliable since some MC could use positive DET_ID
which should only be used for real data

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* Fixed bug which converted MC times in real data. Now it checks for a
positive DET_ID and does not convert (even if told so...)
* Fixes zt-plot, which did not use the newly implemented datatypes

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* fixed bug in math.spatial_angle (zenith vs latitude)
* (aanet) jgandalf_new now computes a ton of fit-spread-related metrics (updated in tohdf5 help string, too)
* added usage warning to math.azimuth. for rest-of-world compatible coordinates, use KM3Astro
* accept coords in polygon containment (contains_xy)

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* The AANetPump now automatically converts hit times from JTE time to MC time.
This should be now the default behaviour for all pumps.
* ``tohdf5`` now has the option to ``--do-not-correct-mc-times`` in case
the automatic conversion from JTE to MC hit time is not wanted
* HDF5 version updated to 4.2 due to the new handling of JTE/MC times.
It is however backwards compatible to 4.1.
* Freezes six-dependency to version 1.10 as the metaclass stuff for
Python 2 is broken in 1.11