FPCUnit command line option to suppress ErrorLevel for consoletestrunner.pas if some tests failed

FPCUnit returns an error code when detecting failed tests. At the same time, many free CI servers (like appveyor) interrupt build process when error codes appear, we have to go to the trick and receive them. I think we need add a command line option to consoletestrunner.pas for suppress this behavior so that it is possible to return 0 regardless of failures, and results can be viewed in the report.

It from here https://forum.lazarus.freepascal.org/index.php/topic,58343.0.html