Re-organise Latin small caps (no functional change)

Re-organise Latin small caps (no functional change)

I liked the approach I took with 'rtlm' of putting variant glyphs next
to the standard ones in the glyph array.  So I've tried doing the same
with small caps.  Each small cap appears at least twice.  For ones with
real Unicode code points, the 'c2sc' version is an alias for the native
one.  For small caps without Unicode code points, the 'c2sc' version is
the actual small cap glyph.  In either case, the 'smcp' version is an
alias for the 'c2sc' one.  This is a change from the previous setup,
where the 'c2sc' version was an alias for the 'smcp' one instead.  I've
swapped them because the small cap glyph is generally based on the full
cap, so putting them together seems sensible.