Fixed a problem with the DNSSEC check with IPv6 on Ubuntu

Added a command line option that generates a critical if TLS 1.2 is offered (--require-no-tls1_2)

Allows an empty argument to the --dane option

Fixed a in the command line options validation for --url and --user-agent

Fixed the command line options checks on openSUSE

Options specified in a configuration file can be overridden again

Minor bug fix removing spurious debugging output

Bug fixes in the handling of command line options

Fixes the output of missing arguments on Nagios

Shows --info event in case of a problem