(Dereference_symlink) [DEREF_COMMAND_LINE_SYMLINK_TO_DIR]: New member.

(Dereference_symlink) [DEREF_COMMAND_LINE_SYMLINK_TO_DIR]: New member.
(enum) [DEREFERENCE_COMMAND_LINE_SYMLINK_TO_DIR_OPTION]: New member.
(long_options): Add option --dereference-command-line-symlink-to-dir.
(main): Make DEREF_COMMAND_LINE_SYMLINK_TO_DIR be the default,
rather than DEREF_COMMAND_LINE_ARGUMENTS, when none of the
-d, -F, -l options is specified.
(decode_switches): Handle --dereference-command-line-symlink-to-dir.
(gobble_file): Honor DEREF_COMMAND_LINE_SYMLINK_TO_DIR.
Change --dereference-command-line (-H) to dereference *all*
command line arguments, including broken symlinks.