bug#33398: 26.1, netbsd-8; Hi Lock Faces, Hi Green B, default setting suggestion

[Juri Linkov]

> 'darkgreen'
>   was what we could agree on for `Hi Green B’ 

'darkgreen' is almost black, and indistinguishable from
the default black foreground color.  A better color
for `Hi Green B' is 'green3'.

>> The same way as hi-yellow is defined to use yellow, and hi-green
>> to use green, we can define hi-blue to use blue color, and
>> hi-pink to use red color.  This will free cyan and magenta
>> to use.

I guess there are no hi-magenta and hi-cyan faces because
Isearch uses the magenta color for the current match and the
cyan color for lazy-highlighted matches.

But OTOH, on TTY magenta and cyan are used from hi-pink and hi-blue,
and there is no problem, so we can define two new hi-lock faces.

> The rainbow/artist’s coloring pencils theme for hi-faces is nicer to
> have for the wm-frame-windowing environment.

emacs/lisp/textmodes/artist.el doesn't have many colors,
and colors from the rainbow-delimiters packages are too dull.