Merge branch '3876_cleanup'

Merge branch '3876_cleanup'

* 3876_cleanup: (47 commits)
  (mc_deserialize_str): trivial optimization.
  (edit_do_search): use gboolean. Remove unused computations.
  (str_8bit_encodings[], str_utf8_encodings[]): make const.
  (etags_set_definition_hash): make buf stack variable.
  (convert_from_8bit_to_utf_c2): use convert_from_8bit_to_utf_c().
  str_convert_to_input() never returns NULL.
  (edit_collect_completions): str_convert_to_display() never returns NULL.
  lib/charsets.c: fix coding style, trivial optimizations.
  (mc_search__recode_str): minor optimization.
  (mc_search__get_one_symbol): cosmetics.
  strutil: character test functions return gboolean instead of int.
  Use str_move() where possible.
  Use gboolean instead of int in file/dir sort related functions.
  (get_codepage_index): minor optimizations.
  (ftpfs_command): minor optimization.
  FTP: fix some calls of ftpfs_command().
  FISH: optimize creation of FISH commands.
  src/vfs/fish/fish.c: allocate buffer for command dynamically.
  (vfs_url_split): Fix 2 memory leaks found by valgrind.
  smbfs: code cleanup
  ...