new feature implemented: highlighting by regexp

[Wes Hardaker <wes@hardakers.net>]

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I'm attaching code I've been tinkering with for a while and it seems to
be doing just fine.  Basically, it allows you to add highlighting
expressions to both summary and article buffer display.  Because gnus
is in a feature freeze, it is entirely self-contained and requires no
patches to gnus to make it work.  Eventually it probably should add
the treatment functions directly to the list in gnus-art.el, but since
I'm assuming it "wouldn't be prudent at this juncture" to check it
into CVS the code should probably not require a patch to gnus-art.el
at this point.  In the mean time, adding (require 'gnus-highlight) to
your .gnus file should be enough to enable it.

I'm interested in any feedback, of course...

There is no info documentation yet, but the variable descriptions
should be adequate enough to get you started.

FYI, I've only checked this under xemacs but I'm sure it's likely to
work without problems under emacs as there is nothing emacs specific
in it.  If the emacs users want to double check it for me, I'd
appreciate it.

Note: you can do cool highlighting using summary buffer bbdb marks and
this.  eg, I have a expression in use that looks like:

	("^......[^EOR].\\+[^[]*\\[\\([^]]+\\)\\]"    . "#b0e0ff")

Which highlights any authors name in a light purple who exists in my
.bbdb (the \\+ in the regexp) and the article is not read, expired or
old (the [^EOR]).  The rest of the expression selects the [.*] that
marks the author's name within the line.

-- 
"In the bathtub of history the truth is harder to hold than the soap,
 and much more difficult to find."  -- Terry Pratchett

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