* lisp/emacs-lisp/eieio.el: Prettier object pretty-printing.

* lisp/emacs-lisp/eieio.el: Prettier object pretty-printing.
(eieio-override-prin1): Don't quote kewords and booleans.
(object-write) <eieio-default-superclass>: Don't put closing parens
on new line, avoid needless empty lines, align values that are objects
with the slot keyword (instead of beginning on the same line).
(eieio-list-prin1): Align value with slot keyword; increase
eieio-print-depth before printing members of the list.

Fixes: debbugs:13115