pyicon_tb.py: In calc_vertical_interp_weights allow interpolations also if field is decreases along axes.

Some fixes for atmospheric plots, datetime64_to_float, temporarily use old_qp_driver.py to prevent errors due to new mapping for ocean data in qp_driver.py

See merge request m300602/pyicon!5

requirements_py39_cartopy19.yml, act_pyicon_py39.sh: Try to use cartopy 0.19 instead of 0.20.x to avoid performance drawbacks from the 0.20.x version.

[pyicon/pyicon_tb.py] Revert pyicon/quickplots/qp_driver.py to master. Also revert pyicon/quickplots/old_qp_driver.py to master with the exception that the Overview tab is taken out of the if do_ocean_plots in order to have that also when only atmo plots are done. Also the order of variables in tab_overview is changed wrt master.

[pyicon_dwd] Minor changes in old_qp_driver.py and qp_driver.py to improve browsing (overview tabs) in case only atmo plots prepared.

[pyicon_dwd] improve run_qp_driver*dwd*, use old_qp_driver.py to prevent errors due to new mapping for ocean data

[pyicon_dwd] Bugfixes, add QP script to plot both ocean and atmosphere at the same time (or optionally only one of them).

pyicon/quickplots/qp_compare.py: Allow to use time averaged data. Adjusted color levels for difference plots.

pyic_tave.py: Enabled use of dask slurm cluster.

See merge request m300602/pyicon!6

notebooks/examp_oce_zstar.ipynb: Some expansions were made and errors corrected in the notebook examp_oce_zstar-copy1.ipynb. These fixes were never commited but now, the old notebook was replaced by the new one.

tools/pyic_sec.py: Allow pyic_sec to be used with the original ICON grids. Two grids are supported at the moment 30W and 170W.

[qp_driver_new_oce_output.py]: Helmuth's suggestions: Use old and new heat flux diagnostic. Change mld to mlotst. Allow mass_flux to be read optionally as vertical integral (new method) or as 3D field (old method).

Added config_qp/conf-r2b6_mkexp.py and config_qp/conf-r2b8_mkexp.py as examples for more variable output in particular that which comes out after mkexp manipulations.