'Process a NEWGROUPS command.  Arguments:
- date: string \'yymmdd\' indicating the date
- time: string \'hhmmss\' indicating the time
Return:
- resp: server response if successful
- list: list of newsgroup names'

def newgroups(self, date, time, file=None):

    return self.longcmd(((('NEWGROUPS    ' + date) + '    ') + time), file)
