Implement a pack file format.
Add elfeed-directory-empty-p.
Ensure data/ exists before writing an archive.
Add elfeed-ref-pack test.
Fix indentation in elfeed-lib.
Add spit and slurp.
Add elfeed-gzip-supported-p test.
Don't use a unibyte buffer for the db index.
Add elfeed-db-compact.
More rigorous gzip testing.
Merge in packfile support.