Log Message:
Update to 0.9.15. Changes:
- preludedb-admin has a bew 'count' command, printing the result of a
COUNT() on the database.
- preludedb-admin work on smaller set of data, to prevent large
retrieval error (fix #220, refs #305).
- preludedb-admin handling of interrupted transaction was improved.
- Fix MySQL and SQLite MacOSX detection, by
Uwe Schwartz <usx303 at googlemail.com>. (fix #296).