clear removed files from server (as function for admins) / #378

For an introduction how file-uploads work read: http://wiki.pixtur.de/index.php/File_uploads

Currently there is no way to remove files from the server. The items are just marked as deleted:

 $file->delete();

Which does something like:

 $item->state = -1
 $item->update()

The item is not(!) been removed from the database and it could be restored everytime. This leeds to the problem, that old files might collect in the _files/ directory and we need a function to go through all files like.

 $files= File::getFiles(array(
   'state' => STATE_DELETED,
   'view_all' => true,
 ));

First this request-type has to be added to the getFiles()-function (see db/class_file.inc). Another (slower) way of doing this might be:

  if($files= File::getAll(array(
    'view_all'=> true,
  ))) {
    foreach($files as $f) {
       if($f->state =-1) {
          unline($f->tmp_file_name);
       }
    }
  }
 
We need a function which is only be accessible for admins (see project options (additional page) for pms and admins) to place this function into the interface.