Implement \f[] as an alternative to \fP. Change \mP and \MP to

\m[] and \M[], respectively.

* src/roff/troff/symbol.cc (EMPTY_SYMBOL): New global variable.
(symbol::symbol): Handle NULL string and empty string differently.
* src/roff/troff/symbol.h (symbol::is_empty): New inline function.
* src/roff/troff/input.cc (read_escape_name, read_long_escape_name):
Add optional parameter.
Updated calling functions.
(get_copy, do_glyph_color, do_fill_color, token::next): Use
`symbol::is_empty'.
* src/roff/troff/env.cc (environment::set_font): Ditto.

* src/preproc/pic/troff.cc (troff_output::set_fill,
troff_output::reset_color: Updated.

* tmac/www.tmac: Updated.

* NEWS, man/groff_diff.man, man/groff.man, doc/groff.texinfo,
doc/homepage.ms, src/devices/grotty/grotty.man, tmac/groff_www.man:
Updated.

* src/include/printer.h, src/libs/libdriver/printer.cc
(printer::change_fill_color): New member function.
* src/libs/libdriver/input.cc (parse_D_command): Use it.

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