genbank.pm: in "_read_GenBank_Species", adjusted a regex to
not match 'str.' or 'var.' when deciding if the line belonged
to CLASSIFICATION instead of ORGANISM. This happened with NC_021815,
and 2 other plasmids because unusually long descriptions:
  ORGANISM  Salmonella enterica subsp. enterica serovar Typhimurium var. 5-
            str. CFSAN001921
            Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacteriales;
            Enterobacteriaceae; Salmonella.