C-j in Lisp interaction mode.

[Luc Teirlinck <teirllm@dms.auburn.edu>]

C-j in Lisp interaction mode overrides `print-length' and
`print-level' using `eval-expression-print-length' and
`eval-expression-print-level'.  The purpose of the latter two
variables would seem to avoid printing huge expressions in the echo
area.  But I do not see any reason to use them in
`eval-print-last-sexp', bound to C-j in Lisp interaction mode.  I
would propose to change `eval-print-last-sexp' to just use
`print-length' and `print-level'.  Also,
`eval-expression-print-length' and `eval-expression-print-level' do
not seem to be documented in the Elisp manual, which makes their use
very confusing to beginning Elisp users.

Sincerely,

Luc.