File number column

I modified webfm.js to include a column with the fileid on the file list. I found it very handy cleaning up after some issues from a 5.x -> 6.x upgrade. Unfortunately I think it may need some work still, as it seemed to misplace the right-click context menus.

The file below is what I was using, then switched back to the original rc4 .js file when we were done cleaning up duplicates. Just remove the .txt extension and put it in place of the original webfm.js . If anyone found this useful / wants to try and finish it off, be my guest.