avoid overlong lines in output to stdout

[lemzwerg]

I suggest that the messages sent to stdout are limited to 80 characters per line (where possible). This increases both readability and makes bug reports easier to read if users are requested to cut and paste messages. As an example, see the overlong lines in the report from https://github.com/mrrfv/open-android-backup/issues/55#issuecomment-1602044351