Save original search strings in queries and original queries in
results.
Add & use ARTICLE-COUNT method for search results.
Don't bother showing term info in PRINT-OBJECT for a corpus; it's not
loaded when restoring from disk anyway.
Remove LOAD-CORPUS and move initialization from disk into INITIALIZE-INSTANCE.
Remove FIRST-ARTICLE, LAST-ARTICLE, NEXT-ARTICLE, PREVIOUS-ARTICLE;
they're based on an arbitrary ordering.

Needs to be based on the date order instead.
Add MAKE-CORPUS-FROM-FILES, a high-level way to build & persist a
corpus.
Export a bunch of stuff.