Rename int-to-string to number-to-string, since it can handle

Rename int-to-string to number-to-string, since it can handle
	floating-point as well as integer arguments.  subr.el defines the
	former as an alias for the latter.
	* data.c (Fnumber_to_string): Renamed from Fint_to_string.
	(wrong_type_argument): Adjust caller.
	(syms_of_data): Adjust defsubr.
	* fns.c (concat): Adjust caller.
	* lisp.h (Fnumber_to_string): Adjust extern declaration.
	* mocklisp.c (Finsert_string): Adjust caller.
	* process.c (status_message): Adjust caller.