Merge branch '4179_cleanup'

Merge branch '4179_cleanup'

* 4179_cleanup: (38 commits)
  Update po/*.po files.
  libcheck: replace deprecated fail_unless() function.
  libcheck: replace deprecated fail() function.
  (hex_translate_to_regex.c): fix maybe-uninitialized warning.
  Fix lto-type-mismatch warning.
  (rotate_dash): type accuracy.
  (widget_set_size): call widget_draw() to get rid of code duplication.
  (mc_g_string_dup): new API that extends GString one.
  (file_entry_t): use GString instead of fname & fnamelen.
  (vfs_path_free): add 2nd parameter...
  (init_subshell_child): use g_setenv() instead of putenv().
  Define macros for bashrc, ashrc, and inputrc files.
  Refactoring of keymap load/save.
  (struct key_config_t): remove.
  (struct name_keymap_t): move from lib/keybind.h to lib/keybind.c.
  (mc_tmpdir): use $MC_TMPDIR if set.
  (show_file_history): keep order of modified history items.
  filemanager/chattr.c: remove TODO.
  Clarify check of 256 colors support.
  Ticket #4173: fix linking of libmc.la.
  ...