Renamed chosenSelects helper to formsHelper
Remove edition form sidebar tab fix

The fix was for Chrome. I tested it without this fix and it
seems that whatever Chrome bug caused the issue has been fixed.
Remove admin create-new.js

It no longer had any effect - it used to handle the new document
dropdown menu, but that's now implemented with $().toggler.
Added navBarHelper
Removed js handling .attachment-mode-select

This was legacy and there's nothing left in the project called attachment-mode-select.