Database/edit_episode: updated a message
Database/query2csv, Database/query2tt2: updated both scripts to handle
SQLite and MySQL databases; both take (almost) the same options;
both query a database in a similar way with arguments to match
placeholders; 'query2tt2' takes a TT² template and options to feed
to it; converted the database connection section to a function
'db_connect'; both have comprehensive POD documentation.
