added kwarg to cca_to_df
changed materialinfo vehicel names to unique ones

Resolve "str to  literal and other minor code consistency cleann-ups"

Closes #5

See merge request urbanoikos/models/cca!5

Resolve "format existing code"

Closes #6

See merge request urbanoikos/models/cca!6

Resolve "Use specific tag in the first steps manual"

Closes #3

See merge request urbanoikos/models/cca!3

Resolve "Update first steps colab"

Closes #1

See merge request urbanoikos/models/cca!2

First complete version

See merge request urbanoikos/cca!1