v0.1.10

Flibusta sidecar covers: read book covers from covers/*.zip|7z

Optimized Flibusta dumps keep book covers out of the fb2, in a parallel
covers/ folder: for a book archive f.fb2-A-B.7z the covers live in
covers/f.fb2-A-B.zip as <book-id>.jpg. extractCover now tries this
sidecar first (cheaper than decompressing the book, and it covers books
with no inline cover), then falls back to the inline fb2/epub cover.
Flows through library.Cover, so web cards, the book page and the OPDS
image links all pick it up. Handles zip and 7z cover archives.