+ adding flag -T- or -t- in file name for type material
+ adding flag -w- in file name for genomes excluded from RefSeq

VERSION 0.4.200504ac
+ discarding option -t (type strain info)
+ option -t for multithread (instead of -c)
+ adding single quote (') in the list of special characters
+ deals with wgs_master starting with 6 alphabetic characters
+ new option -f to download different file types
+ new option -z to keep compressed format