Change version to 0.9
Fix: ED(n) / D(n) has very low precision for small n

This was caused by using the Apfloat( String value ) constructor,
where the precision is determined by the number of characters in
the value String. So 2, 3, 6 would all have only one digit of
precision!
Make printing column headers more ledgible
Make code more readable, by renaming "output" to "outputFormat"