Revert "remove blank footnote sups in edit.php"

This reverts commit e7dde968f91039c1b04cf2b52a99548a6a2a8dde.
Revert "Revert "remove blank footnote sups in edit.php""

This reverts commit 9de9c3666d5001218710f952301c51809f73bf1e.
Merge remote-tracking branch 'upstream/master'
Add a waiting message in browser when file list is loading (issue #27)
Merge pull request #28 from Jguilbaud/MediaManagerWaitingMsg#27

Media manager waiting msg #27