pyic_view: Using .pack instead of .group to place widgets. Option to update data range to zoom area.

pyic_view: Fixed a typo regarding uuidOfHGrid. Added more cmaps. Try not to identify fpath_ckdtree here but push this to interp_to_rectgrid_xr.

pyic_view: Add uugridid to each variables of ds so that also non-cell variables like vorticity can be plotted.

pyic_view.py: Some bug fixes with depth dimensions and slider to also allow plotting atmosphere and ice variables.

pyicon_tb.py: Use flattened array in interp_ckdtree_xr (as was done until some commits before) to avoid dask issues.

pyic_view.py and setup.py: Initial commit for the tool pyic_view that opens a GUI for browsing through ICON data.

qp_driver.py: Changed back to gname=0.3 since gname=0.30 breaks with most of the grids. Those that were created for gname=0.30 were created to get gname=0.3.