Merge branch '2603_cleanup' into 4.7.5-stable

Merge branch '2603_cleanup' into 4.7.5-stable

* 2603_cleanup:
  (try_complete): fixed warinig:
  (edit_collect_completions): fixed warinig:
  (etags_set_definition_hash): fixed memory leak
  Use ESC_STR macro instead of hardcoded "\033".
  Value accuracy of mouse_enabled global variable.
  Nice location of red (warning and error) dialogs.
  (dlg_find_by_id): use the GLib way to find widget.
  (move_right): fixed type of return value.
  (menubar_arrange): fixed typos.
  Minor fixes in NEWS.
  Preventing po/*.po files in git-diff output
  Editor: remove unused #define's.
  Optimization of walking in dialog widgets.
  Set logfile for smbfs using mc_setctl().
  Ticket #2603: cleanup branch