Qa4sm-reader

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- Added function to retrieve the package version

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- QA4SM release 2 version
- Status maps and box plots
- FRM box plots added
- Scaling reference units used on plots
- SMOS and SMAP L2 added

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- update on plots of datasets with irregular grids
- Quick inspection table added
- IQC instead of StdDev added to plots

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- Switch from Travis CI to GitHub Actions
- Allow plotting from irregular grids (SMOS, ASCAT)

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- Fix bug that lead to failing plots for CCI combined

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- Fix bug that could break global overview maps
- Resolve deprecation warnings caused by cartopy