Merge branch '2740_cleanup'

Merge branch '2740_cleanup'

* 2740_cleanup: (28 commits)
  Added new entry to the external panelize - "Modified git files".
  Disable resizable menu.
  Ticket #2748: wrong message in menu item "Delete tagged files if a copy exists in the other directory".
  Fixed handling actions in chmod dialog
  (extfs_get_path_mangle): renamed to extfs_get_path_int
  (extfs_get_path_mangle): minor optimization.
  (panel_reload): fixup of panel current directory obtain.
  (edit_load_file_from_filename): fixed file unlocking.
  Typo fix in message
  (expand_format): minor optimization.
  Added default shortcuts for dynamically resize panels.
  Fixed preprocessor conditions.
  find.c: drop support of legacy config option.
  Added macros for Layout and Misc sections of main config file.
  Reorder fields in mc_global struct and change type for some of them.
  Removed useless return.
  Editor: avoid extra screen redraw.
  editdraw.c: removed unused defines.
  Tweak key bindings.
  Tweak background operations support.
  ...