fix debug output during trace

[algorythmic]

It's a bit confusing that some output (that which is guarded by args.debug) is only present when running with a single -v but not with -vv. I suspect that wasn't the intention.

[MestreLion]

It was intentional for some time, as trace (-vv) was an undocumented flag created just to show the git commands executed, and so the debug (-v) lines for each processed file were disruptive. But you're right, this is confusing and counter-intuitive, so it's better to fix. Thanks for the PR!