Feature: vertical space to indicate pause

Originally reported on Google Code with ID 205 ``` What steps will reproduce the problem? 1. Do "1+2" 2. Go and make some tea 3. Come back and do "sin(pi/4)"

What is the expected output? The recent calculation - "sin(pi/4)" - should be separated by little vertical space so as to indicate that there is a pause/delay between "1+2" and "sin(pi/4)".

This is even much more useful if the user does a series of long calculations, pauses, and the does another long calculations. ```

Reported by `ariya.hidayat` on 2008-07-19 11:09:08

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