Improve diff numbering + messages

[pederhan]

Numbering

This PR adds a number for each diff for better readability when reviewing them.

Number shown before diff

Number shown when reviewing the change

Added breathing room between each diff

Improved messages

We also keep track of the number of resolved and unresolved diffs and print messages and exit accordingly.

All diffs resolved

Mix of resolved and unresolved diffs

No diffs found

[terjekv]

Oh yes, great stuff! :)