[BUG] detect_breakends writes to err even if no error occurred.

[simonsasse]

The application detect_breakends writes results to the err although no error occurred.
This behavior can be seen here #19 and in the detect_breakends_cli_test.

EDIT (29.3.2021): Print only output in err depending on the verbose flag (-v, -vv, ...). This is a follow up for issue #20 .

[Irallia]

I spoke to @eldariont yesterday. The output is generated separately from the debug_stream, but contains the same output as the result output. It was mainly used for developing and debugging.
Eventually we will solve this "problem" when editing the ticket to add a verbose flag. And then we can probably just delete a part of these outputs #20.