Merge branch '2845_cleanup'

Merge branch '2845_cleanup'

* 2845_cleanup:
  Clarify cvs dependency.
  (mcview_moveto_eol): comparison of unsigned expression < 0 fixup.
  Makefile.ams cleanup.
  Code indentation.
  Try fix of compile warnings about assigned but unused variables
  Code cleanup: removed unused variables amd removed unnedeed code.
  (exec_extension): ret rid of double filename conversion.
  Ticket #2839: Fix keybindings for Quit command of mcedit.
  Tweak of select codepage code in case of --disable-charset
  Fix of 'External panelize' dialog: update of 'Command' field content after mouse click.
  Fix of f13 key handling.
  Fix typos.
  Ticket #2538: mcviewer: unused result of str_term_width1().
  src/filemanager/mountlist.c: apply mc code indentation policy.
  Ticket #2845: code cleanup before 4.8.4 release.