lynx-dev Lynx and Euro symbol support

[Jacob Poon]

Regarding the new Euro symbol, apparantly current Lynx development code
does not support the Euro character on all Lynx-supported display
character set.  The key reason is, there is no 7-bit approximation of Euro
symbol that Lynx can fall back to.

Anyway, there's more that contributes to lack of full Euro support.  The
7-bit approximations table in file src/LYCharSets.c must match exactly the
table referred to in the DTD.  The problem for this is, the DTD table in
HTMLDTD.c is static, which means adding support to Euro (or any entity
refernces) will be very awkward, because HTMLDTD.c and all the
approximations in LYCharSets.c must be completely updated or it will break
Lynx.