Merge branch '2741_cleanup' into 4.8.1-stable

Merge branch '2741_cleanup' into 4.8.1-stable

* 2741_cleanup: (22 commits)
  Ticket #2748: wrong message in menu item "Delete tagged files if a copy exists in the other directory".
  (extfs_get_path_mangle): renamed to extfs_get_path_int
  Typo fix in message
  (expand_format): minor optimization.
  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.
  Removed mcserv.8 target.
  lib/tty/win.c: includes cleanup.
  Include sys/param.h conditionally.
  Check assert.h header and use it conditionally.
  Minor optimization of memory allocation for string copy.
  (examine_cd): split in two functions to be unit test friendly.
  Removed check of unused functions.
  ...