v0.1.15

Read books named by id without extension inside archives

Optimized Flibusta dumps (f.fb2-*) name fb2 entries by book id with no
".fb2" extension, so opening "<id>.fb2" failed with "entry not found".
Fall back to a bare-id entry match (exact name still wins, and matching
the stem keeps a cover "<id>.jpg" from being picked instead).