* guix/store.scm (%protocol-version): Bump.
(operation-id): Comment out `query-substitutable-path-info'.
Rename `query-valid-paths' to `query-all-valid-paths'. Add
`query-path-from-hash-part', `query-substitutable-path-infos',
`query-valid-paths', and `query-substitutable-paths'.
(set-build-options): Add `binary-caches' keyword parameter. When
using a server >= 1.12, send the list of binary caches.
(query-path-hash): Use the `store-path' type, for clarity.
63193ebfdc