Merge branch '4524_cleanup'

Merge branch '4524_cleanup'

* 4524_cleanup: (40 commits)
  Update po/*.po files.
  (link_t): remove unused member linkcount.
  src/filemanager/file.c: fix comment.
  src/filemanager/file.c: rename structure: link -> link_t.
  (fetch_hosts): refactoring.
  hostname complition: refactoring: use GPtrArray.
  (load_codepages_list_from_file): use g_ptr_array_new_full().
  src/selcodepage.c: fix coding style.
  (tree_move): fix coding style.
  (info_show_info): don't create VFS path if EXT2 attributes aren't supported.
  file_op_context_t: remove op_preserve member.
  (shell_execute): fix coding style.
  (tar_seek_archive): improve diagnostic for truncated archive.
  Move OS-specific stuff from lib/global.h to lib/unixcompat.h.
  Merge lib/utilunix.h into lib/util.h.
  Merge lib/strescape.h into lib/strutil.h. Rename functions.
  Set the default IO size to 256KiB.
  (find_cmd): add intermediate variable to simplify formatting.
  mceditor: massive use of edit_arg_t as function argument.
  mceditor: new APIs.
  ...