Moniplot

Fixed
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* Fixed determination of dataset dimensions and coordinates when a HDF5 dataset or netCDF4 variable is stored in an xarray DataArray structure.
* Added description on how the dimensions and coordinates are determined.

New
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* Added sequential color scheme "Incandescent"

Fixed
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* fix case when a dimension scale has length zero
* handle dimensions without coordinates correctly
* netCDF specific attributes (starting with an underscore) should be neglected
* minor bugfixes
* updated the requirements when installing the software

Changes
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This release improves the layout of MONplot::draw_signal and MONplot::draw_quality figures.
And includes some minor bug fixes and coding improvements.

All users should upgrade.

Changes
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* first public release of moniplot via PyPI
* includes the usual (minor) bugfixes and documentation improvements

- all basis functionally is included in this release
- new is the method multiplot (requires more documentation)
- added textbox option to method draw_lplot (requires more documentation)
- histograms are looking much nicer
- includes also many bug fixes, code improvements and documentation updates

Known issue: the tickmarks of the colorbar, with zscale='ratio', need more work get them correct.

- Added method draw_hist() to class MONplot
- Made result of method draw_qhist look much nicer
- Replaced method keyword exclude_region to keyword data_sel
- fixed several bugs