#4346: Use add/file/private for adding private files. Fix file/add so it doesn't add private files anymore.
#4346: Add 'Add File' link to content/files. Change link private files list.
#4346: Redirect to edit file form after adding new public file.
#4346: Only redirect if we're not in the media browser. Close the overlay after saving the file edit form.
#4346: file/add saves file to the right directory
Merge pull request #4517 from openscholar/4346-file_add

File Add in CP Content Files