Merge branch '3693_cleanup'

Merge branch '3693_cleanup'

* 3693_cleanup: (22 commits)
  Update copyright years.
  (tar_fill_stat): add omitted breaks.
  Aggressive use of whitespace() and whiteness() macros.
  WCheck, WRadio: send MSG_MOTIFY without parameter.
  Fish shell integration: ignore mc's prompt in history.
  (tty_color_get_name_by_index): cleanup format compiler warning.
  Cleanup comma compiler warnings.
  (sftpfs_open_file): GCC zero initialization bug workaround.
  Cleanup maybe-uninitialized compiler warnings.
  (mc_search__g_regex_match_full_safe): don't use negative string length.
  mcedit: syntax.syntax: highlight comments preceded by spaces.
  misc/syntax/Syntax.in: fix patterns.
  Use g_queue_free_full().
  (mc_search__cond_struct_new_regex_ci_str): add documentation.
  option_auto_syntax: change type to gboolean.
  src/setup.c: minor refactoring of main options load.
  setup: split integer and boolean options.
  Change type from int to gboolean for variables controlled by checkboxes.
  WCheck: change type of 'state' from int to gboolean.
  WCheck: remove unused C_CHANGE.
  ...