update slang to 2.0?

[Bill Nottingham]

Any objections to updating slang to version 2.0 in rawhide/FC5? I
can do the initial legwork.

It includes native unicode support, as opposed to relying on the
hacked-to-death UTF-8 slang patch we have now.

It would require rebuilds of the following:

In Core:
newt
slrn
crypto-utils
timidity++
system-config-securitylevel
mc

In Extras:
caca
aalib
most
jed

Plus, we'd probably move compat-slang to providing the unicode hack one,
as opposed to the pre-RHL8 version it has now.

Bill