added IPv6 records to the dns bruteforcer
changed values of 'partial' var. Allowed now are: (0,100]
fixed update_status_step call
Added processing and displaying of error and warning messages. Fixed text of status message when it's empty
removed repeated code and a 'print' call. Changed calls to the logger for update_status instead
changed value of update_status_step. Now values are between (0, 100]