largefiles: make verify --lfa and --lfc work without --large
The slightly obscure --lfa and --lfc only worked as modifiers to --large and
could be combined. The documentation was however not clear what they did.
Instead they now imply --large and the description is updated.
largefiles: report localstore errors with single line warnings messages
The actual hash is also not relevant to report.
This makes verify output with multiple failures easier to process.