(math-scalar-functions, math-nonscalar-functions)

(math-scalar-functions, math-nonscalar-functions)
(math-scalar-if-args-functions, math-real-functions)
(math-positive-functions, math-nonnegative-functions)
(math-real-scalar-functions, math-real-if-arg-functions)
(math-integer-functions, math-num-integer-functions)
(math-rounding-functions, math-float-rounding-functions)
(math-integer-if-args-functions, math-super-types):
Move declarations to earlier in file.

(math-unit-prefixes): Declared it.

(math-floor-prec, math-trunc-prec): New variables.
(math-trunc-fancy): Replace variable prec by declared variable.
(math-floor-fancy): Replace variable prec by declared variable.

(math-com-bterms): New variable.
(math-commutative-equal, math-commutative-collect): Replace variable
bterms by declared variable.