Provide informative error when UPAC code hit and tool fails.

[jfy133]

Some of the 'genomes' I downloaded and tried to input were actually unfinished assemblies:

e.g. GCA_001057035.1_ASM105703v1_genomic.fna

These contained symbols such as W/R/S in the sequence itself.

I would suggest that either if this is encountered that adrsm reports a nice error (rather than traceback) stating this isn't accepted, and please fix.

You could also suggest the following command to clean it up:

sed -i '/^[^>]/s/[R|Y|W|S|M|K|H|B|V|D]/N/g' *.fna