An rss.chat server can now run on SQLite -- no MySQL, no database setup of any kind

One new member in config.json chooses the engine: "database": {"flUseSqlite": true, "databaseFilePath": "data/myserver.db"}. The database is a single file that creates itself, tables and all, the first time the server runs -- the install becomes download, npm install, run. Everything else is identical: same features, same feeds, same API, and a server that says nothing stays on MySQL exactly as before. The engine itself went into davesql (v0.7.0), where all the SQL expertise lives, so the same switch is available to every app built on it. The first server running this way is live at scratchpad.rss.chat -- sign-up, posting, replies, likes, and feeds, all served out of one file on a fresh droplet that has never heard of MySQL.