events, file lock, swing?

Events are done, the print and println methods have now been removed from the UI. Time now for a Swing GUI? I'm so tired of trying to work with a text display! But one thing I want to fix first...

You should never have two instances of ArkDb running at the same time on the same files. Its a great way to corrupt the database. So lets have a lock file which exists while ArkDb is running and which prevents another instance from starting up.

Bill