v2.5-1
Changes:
- Detect failure to retrieve version numbers of all public SailfishOS releases
- Also check for omitting a "stop release", when called without a parameter
- Tried to unify message structure: The first line of each output statement of the sfos-upgrade and post_sfos-upgrade proper is now prefixed with an "Aborting", "Warning" or "Notice", plus each "Warning" and "Notice" ends with an empty line (which is superfluous when aborting), emitted when the specific check or balance is finalised.