6cbe4e1311
`{install_status}` is handled in a funny way in `Spec.tree()`, and it can't be used in
other useful places like `Spec.format()`.
- [x] Make `{install_status}` a format attribute like most other things we want to print
about specs.
- [x] Refactor whitespace handling in `Spec.format()` to only strip whitespace that wasn't
in the original format string (i.e. that was added by our own attributes)
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