Add metaphlan database location to humann3 log file

Feature Request Name: Add metaphlan database location to humann3 log file

Detailed Description: It remains unclear what database is being used during the prescreening process within Humann3. The log file output from the Humann3 pipeline includes the nucleotide, protein, pathways and utility mapping database folders, but not the one used during the prescreening step (i.e., mpa_v30_CHOCOPhlAn_201901, I think?). Further, it was unclear to me (e.g., a new user) what the difference was between the mpa_v30_CHOCOPhlAn_201901 and full_chocophlan.v296_201901b databases were. A similar issue was raised previously.

Category: Documentation

Thank you for your consideration,
Chris