Font-lock colors

[Gerd Moellmann]

With everything set to defaults, I think current font-lock faces are
very sub-optimal, to the point that some text is hardly readable on my
display (examples: include-directives in C text, variable names,
built-ins).  Something has to happen---what about the faces below?

 '(font-lock-builtin-face ((t (:weight bold :slant normal))))
 '(font-lock-comment-face ((((class color)) (:slant oblique :foreground 
"Brown"))))
 '(font-lock-constant-face ((((class color)) (:foreground "darkblue"))))
 '(font-lock-function-name-face ((((class color)) (:foreground "DarkBlue"))))
 '(font-lock-keyword-face ((t (:weight bold :slant normal))))
 '(font-lock-string-face ((((class color)) (:foreground "DarkGreen"))))
 '(font-lock-variable-name-face ((((class color)) (:foreground "DarkBlue"))))