(x-font-name-charset-alist): New

(x-font-name-charset-alist): New
variable.
(register-alternate-fontnames): Doc-string modified.
(x-complement-fontset-spec): Likewise.
(x-complement-fontset-spec): Delete unused local variable.  Delete
ad hoc code for Latin-1, instead refer to
x-font-name-charset-alist.
(uninstantiated-fontset-alist): Format changed (BASE-FONTSET ->
FONTLIST).
(x-style-funcs-alist): New variable.
(create-fontset-from-fontset-spec): 2nd optional arg is changed
from STYLE to STYLE-VARIANT-P.  The meaning also changed.  Delete
unused code.  Adjusted for the change of
uninstantiated-fontset-alist.
(instantiate-fontset): Adjusted for the change of
uninstantiated-fontset-alist.