Finally solve the S-hachek problem

Finally solve the S-hachek problem

I had been trying to find an upper-case that was visibly distinct from
the existing lower-case, but I realised that I could do the same as we
do with accented 'o' and instead make a new lower-case version and
declare the existing glyph to be upper-case.  This seems to work
tolerably and removes the most embarrassing gaps in Bedstead's
repertoire.