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Config file structure has changed (tooltip settings relocated).
Added polynomial interpolation plots. Ref. command line arguments reference, '--poly-int'.
If the output directory is not specified, one is created (in the current directory).
Added a DEMO
README.md improved
Added a logo
Now the initial diagnostic, if active, show also system's PATH
Fixed an issue where the documents were not present in the PYPI package
Other minor optimizations and fixes