Include new file quotearg.h.

Include new file quotearg.h.
(enum indicator_style): Rename all to classify, and not_programs
to file_type, to match option spellings.  All users changed.
(indicator_style_args): New constant.
(quote_funny_chars, quote_as_string, quote_shell): Remove;
(filename_quoting_options, dirname_quoting_options): Use these
variables instead.
(long_options): Add --indicator-style, --quoting-style,
--show-control-chars.  Remove --quote-shell.
(dired_dump_obstack): Remove style parameter and don't output style.
(main): Go back to previous method of outputting //DIRED//
and //SUBDIRED// lines, without style.  But add a new
//DIRED-OPTIONS// line that does output style.
(decode_switches, usage): Add --indicator-style, --quoting-style,
--show-control-chars.  Remove --quote-shell.
(decode_switches): Default from QUOTING_STYLE environment variable.
Set new quoting vars.
(quote_name): Renamed from quote_filename.
Take new arg specifying quoting options.
Always print; do not have a special case for null FILE * argument.
All callers changed.
Move the guts of this function to new file quotearg.c.
(length_of_file_name_and_frills): Use quotearg_buffer instead
of (old) quote_filename to find length of file name.
(decode_switches, parse_ls_color, print_dir, gobble_file,
get_link_name):	Quote output in diagnostics.