Fit some Debian lint

Description

This MR fixes some debian lint as follows

• fix the syntax of the copyright file
• update the Priority for the oldlibs packages

This just resolves a few lintian complains.

API Changes and Justification

Backwards Compatible Changes

• This change introduces no API changes
• This change adds new API calls

Backwards Incompatible Changes

• This change modifies an existing API
• This change removes an existing API

If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.

Review Status

Please provide details on any reviews related to this change and and the associated reviewers.