Added module to test and live filefield_sources

Committee or Team: 
Web Design
Drupal configuration
Drupal 6 Live
Walt Daniels
Details: is part of the path to D7. It augments the file content type which replaces upload in D7 but works in D6. In D7 there are no attached files so they get migrated to a CCK field called file. This allows us to move to those before D7 and then moving nodes will be easier. In particular it allows the equivalent of how we use IMCE in loading images in textareas, so you can now browse for existing files and a bunch of other options.There is code to migrate the current attachments to being files which will make the transition easier.