(calc-yacas-language, calc-maxima-language, calc-giac-language)

(calc-yacas-language, calc-maxima-language, calc-giac-language)
(math-yacas-parse-Sum, math-yacas-compose-sum)
(math-yacas-compose-deriv, math-yacas-compose-taylor)
(math-maxima-parse-subst, math-maxima-parse-taylor)
(math-maxima-compose-taylor, math-maxima-compose-subst)
(math-maxima-compose-if, math-lang-switch-args)
(math-lang-compose-switch-args, math-read-giac-subscr):
New functions.

(calc-lang-allow-underscores, calc-lang-allow-percentsigns)
(calc-lang-brackets-are-subscripts, calc-lang-c-type-hex):
Add languages.

(math-vector-brackets, math-complex-format, math-variable-table)
(math-parse-table, math-oper-table, math-function-table)
(math-special-function-table, math-compose-subscr):
Add values for new languages.