Genbank short version is downloaded

`vsnp_fasta_gbk_gff_by_acc.py -b -a <ncbi accession>` downloads the genbank short version and not the long version.  The long version is needed by vSNP_step2.py to annotate tables.  Manually downloading the long version from a web browser and placing into the dependency folder is current work around.  Remember to check the file coding (UTF-8, LF).