Update notebook names to match change of data reference as catalog.

Updated data file names to reference they are catalogs, changed read in notebooks to match.

Analysis of updated datset.

Updated EDA (#1)

Updated count information to include all values that should show up as warnings when running check_taxa.

Generated CSV for testing check_taxa script (auto-check for filled-in taxonomic hierarchy).

Add notebooks analyzing the dataset contents, taxa distributions, etc. and generating visualizations.