Display item titles in podbeuter download listings.

Queue file format changed to contain additional field for download
titles. This breaks the backwards compatibility with old queue files.
The structure queue entries is now URL PATH TITLE [STATUS]

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I think displaying episode titles in podbeuter would be an useful improvement, but unfortunately the queue file format isn't really expandable without breaking compatibility with earlier versions. Migrating from old to the new format is a matter of adding one mandatory title field between path and optional status fields. This pull request doesn't include anything to ease the transition so I wouldn't necessarily merge it as it is. Do you think this would be a welcomed change and if so, how should the compatibility issue be handled?

This is just something I hacked together in one evening for my own use and I haven't really tested in thoroughly. It works on my machine...