Find in filenames only considers DOM elems not actual files on drive

[mattpass]

This is a hangover from older versions of ICEcoder where the entire dir tree was present in file manager on load. We now load dir contents when opening a dir on demand, but the logic for find in file names remains legacy.

So it's not finding all filenames now. Needs recoding to work from contents of drive and not scanning DOM elems.

[mattpass]

As part of this issue, review, refactor and improve multiple-results.php as a whole.