9a6e51ccf0
Defines `spack.package_api_version` and `spack.min_package_api_version`
as tuples (major, minor).
This defines resp. the current Package API version implemented by this version
of Spack and the minimal Package API version it is backwards compatible with.
Repositories can optionally define:
```yaml
repo:
namespace: my_repo
api: v1.2
```
which indicates they are compatible with versions of Spack that implement
Package API `>= 1.2` and `< 2.0`. When the `api` key is omitted, the default
`v1.0` is assumed.
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