Merge branch '3780_cleanup'

Merge branch '3780_cleanup'

* 3780_cleanup: (26 commits)
  src/vfs/extfs/helpers/README: fix path to user scripts.
  (button_callback): clean up unneeded type casting.
  Fix 2nd argument of gauge_show() call.
  Sync with gnulib 3b1faeb2e29b62588709208f97d34c1787777dcb.
  (do_link): minor optimization.
  (do_link): fix coding style.
  Syntax.in: simplify pattern for HiveQL.
  (vfs_path_from_str_deprecated_parser, vfs_path_from_str_uri_parser): remove unused flags argument.
  (vfs_path_from_str_uri_parser): fix detection of relative path.
  (diff_two_paths): optimizate path comparision.
  (diff_two_paths): minor optimization: exit loop ASAP.
  (diff_two_paths): reduce variable scopes.
  (message): Use "%s" to fix incorrect translation with printf pattern(s)
  (parm_table[]): Make const to relocate 13624 bytes from .data to .text. (init_globals): fstring is enough for "%d.%d". (*): Remove nmbd code.
  (_interpret_node_status): Remove dead code.
  (buttonbar_call): fix possible NULL dereference.
  (mcview_mouse_callback): fix typo.
  (jobs_fill_listbox): cleanup pointer-compare warning.
  (set_panel_filter_to): rename variable and use MC_PTR_FREE macro.
  (set_panel_filter): fix coding style.
  ...