[Enhancement] Reorganize artifical data examples to make them easier to follow

[misi9170]

Ready for review and possible merge.

Feature or improvement description
Some reorganization of the examples was needed for clarity. In particular,

1. A subdirectory names examples/ still existed under the flasc/ source code directory, which contained example input files and a utility for loading them but no example code.
2. The artificial_data examples were not clearly laid out

These have now been addressed by

1. Moving models.py up to flasc/ and renaming it utilties_examples.py and moving the example input files to their respective examples_ directories (examples_smarteole/ and examples_artifical_data/)
2. Numbering the subdirectories and files within the subdirectories of examples_artifical_data/

Related issue, if one exists
#113

Impacted areas of the software
examples_artifical_data/, examples_smarteole/, flasc (to a small extent)

Aditional notes

• A small bugfix was also made to handle the default behavior of plot_energy_ratio() from energy_ratio_output.py when polar_plot = True.
• This PR removes @Bartdoekemeijer 's old NREL email address and supplies @paulf81 and @misi9170 's ones instead
• A final small bugfix moves changes some polars commands to update to syntax and updates polars version requirement to 0.19.0

Test results, if applicable
Test pass after polars update

[paulf81]

Modified the description to include the small polars bugfix

[paulf81]

This looks great @misi9170 , thank you! I pulled it down and tested examples and everything ran well, thank you!