Merge branch '2846_cleanup' into 4.8.1-stable

Merge branch '2846_cleanup' into 4.8.1-stable

* 2846_cleanup:
  Clarify cvs dependency.
  Indent files.
  (mcview_moveto_eol): comparison of unsigned expression < 0 fixup.
  Try fix of compile warnings about assigned but unused variables
  Code cleanup: removed unused variables amd removed unnedeed code.
  Fix of f13 key handling.
  Ticket #2538: mcviewer: unused result of str_term_width1().
  src/filemanager/mountlist.c: apply mc code indentation policy.
  Sync with gnulib 06b335ade65c8fe60fee8b9e18b670bb54ed924a:
  Minor optimization and type accuracy of some editor functions.
  Fix of mult-byte characters and tabulation printing.
  Menubar: ignore GPM_UP event.
  Accuracy use of arguments of dlg_move and widget_move macros.
  Ticket #2846: code cleanup before 4.8.1.4 release.