New Features for Printing And Formatting Output

• The format function has a new feature: `%S'. This print spec prints any kind of Lisp object, even a string, using its Lisp printed representation. By contrast, `%s' prints everything without quotation.
• prin1-to-string now takes an optional second argument which says not to print the Lisp quotation characters. (In other words, to use princ instead of prin1.)
• The new variable print-level specifies the maximum depth of list nesting to print before cutting off all deeper structure. A value of nil means no limit.