HTML 4.0 character entities

Hi,

I updated the list of character entities with the new names from the HTML 4.0
DTD.
You can find the changes in:

http://dev.w3.org/cgi-bin/cvsweb/libwww/Library/src/HTML.c 1.80
http://dev.w3.org/cgi-bin/cvsweb/libwww/Library/src/HTMLPDTD.c 2.31
http://dev.w3.org/cgi-bin/cvsweb/libwww/Library/src/HTMLPDTD.html 2.31

-- Raffaele