file format
- show error message when trying to open a .zip file that doen't contain
the expected files of a Samsung J series or Toshiba .zip channel list
- show error message when trying to open a broken .zip file, which is
most likely caused by exporting to a USB stick formatted with NTFS
- allow changing the "crypt" flag for Samsung .scm lists
- iterating through loaders supporting a file extension till one can read the file
- Samsung E,F,H,J .scm file format: allow independant reordering of each favorites list (with editable numbers)
- Samsung J .zip file format: predefined lists can be edited again, allow independant reordering of each favorites list (sequential numbers), allow deleting channels
