Use output_name as default title

[kvid]

The CLI handling code was redesigned for v0.4 and it seems the code to assign a default title from v0.3.1 has been messed up. This bug has not been triggered by build_examples.py due to it seems to call the parse() function differently.

The output_name should be used as default title when present.

This will fix the #360 bug report.