- A book carries schemaRev. The reader that meets a newer one opens the book
read-only with a reload banner and saves nothing, where it used to drop the
elements it could not read on the next save.
- The server refuses a save, a restore or a tool edit that would write an older
revision over a newer book or one newer than itself (409 book_schema_newer),
on REST and through every book tool alike.
- normalizeBookDocument moves to book-normalize.ts.
- Print waits for photos eagerly and up to 15 s for an export of more than 40
photos, and skips images without a source.
Maurice