[Groff] picture names with -Thtml

[Werner LEMBERG]

Gaius, 


is there any chance to improve picture names with -Thtml?
`grohtml-32047-48.png' is really ugly.  And it has some great
disadvantages:

  . If you rerun groff, you get another set of images because the
    process id has changed.  This should be enabled only for debugging
    purposes.

  . It is far too easy to accidentally remove an image if you have
    many of them due to the similarity of the names.

  . It isn't possible to recognize which image belongs to which
    document (and vice versa).

What I would like to see is that images are named `foo-nnn.png' for
document `foo' (nnn a running number).  Another nice thing would be to
have an option so that grohtml put all images into a subdirectory.


    Werner