Wavespectra

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Bug Fixes
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* Add numba to setup.py, not installed properly from requirements/default.txt for some reason.

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New Features
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* Watershed partitioning now supports dask (`PR27 <https://github.com/wavespectra/wavespectra/pull/27>`_).
* Spectral splitting now supports dask.
* The following spectral parameters now support dask (`PR11 <https://github.com/wavespectra/wavespectra/pull/11>`_):
* tp
* dp
* dpm
* dspr
* Wavespectra conda recipe by `Ruben de Bruin`_.

Internal Changes
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* Core watershed partitioning code organised into watershed module.
* `max_swells` replaced by `swells` in watershed partition to return fixed number of swells.
* Renamed module `wavespectra.core.misc` by `wavespectra.core.utils`.
* Removed deprecated method `_same_dims`, `_inflection` and `_product` from `SpecArray`.
* Get rid of simpy dependency.
* New daskable stats defined as ufuncs using numba.
* SpecArray attributes redefined as property methods.

Bug Fixes
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deprecation
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* Drop support for python < 3.7
* Dropped args `hs_min` and `nearest` in `SpecArray.partition`.


.. _`Ruben de Bruin`: https://github.com/RubendeBruin

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New Features
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* Handle ndbc spectra files with no minutes column (`PR25 <https://github.com/wavespectra/wavespectra/pull/25>`_).
* Writers `to_swan`_ and `to_octopus`_ now deal with extra non-supported dimensions.

Internal Changes
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* Stop fixing pandas and xarray versions.
* Remove attrdict dependency.
* Define `_FillValue` in `to_netcdf`_.

Bug Fixes
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* Fix bug in sel with `"nearest"` option.
* Ensure last time chunk is written in `to_swan`_ when the dataset time size is not divisible by ntime (`GH20 <https://github.com/wavespectra/wavespectra/issues/24>`_).


.. _`to_netcdf`: https://github.com/wavespectra/wavespectra/blob/master/wavespectra/output/netcdf.py

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Internal Changes
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* Optimise `to_swan`_ (over 100x improvements when writing very large spectra).
* Optimise `to_octopus`_ (over 10x improvements when writing very large spectra).
* Allow loading time chunks when writing swan and octopus files.

.. _`to_swan`: https://github.com/wavespectra/wavespectra/blob/master/wavespectra/output/swan.py
.. _`to_octopus`: https://github.com/wavespectra/wavespectra/blob/master/wavespectra/output/octopus.py

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New Features
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* New json reader and writer (`PR21 <https://github.com/wavespectra/wavespectra/pull/21>`_).

Internal Changes
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* Raise exception when trying to compute directional methods on 1d, frequency spectra.

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Bug Fixes
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* Fix bug in sel methods.