Pin to release version of Bio-Formats (4.4.8)

This facilitates repeatable builds, since all dependencies are now
release versions.
Fix JGoodies Forms runtime class reference

This enables the Plastic3D L&F to work again with the newer version of
Forms now being used.
Make OME-XML extraction work again

The newer ome-xml library no longer uses a DOM-backed OME-XML node
structure, so we need to do some extra work to convert it into an XML
Document object for use with the XMLCellRenderer.
Always turn on Apple screen menu bar

On non-OS X platforms it has no effect, and on OS X is provides better
native integration.