Add a "newsgroup.lst" import feature to import a list of newsgroups from a text
file (one newsgroup name per line). The newsgroup name is used for all the area fields/names, removing the group name if applicable. Any additional text following the first word of each line is ignored. Also sets the INET/NTTP networked flag for all the imported subs. Also, fixed apparently long-standing bug where QWK name of imported subs was always overwritten with sub's short name.