No newline in REPL output before printing user input

[DanBurton]

This is a really minor thing, but it's annoying to see this:

user=>
(+ 1 1)
2

Instead of this:

user=> (+ 1 1)
2

Can we just not print that newline, and simply flush the output (if that's necessary) after printing "user=> "? I do think that it should keep printing "user=> " when it is ready to accept more input.

[ghost]

I think this should be configurable (do newline or don't newline), because when I do Ctrl+Enter to eval form or Ctrl+E to eval file, I like it better with newline.