Add auto level detection for notes

[jomaway]

If two note field are placed before the same data field or even two data fields which are shown in the same row, it will result in an error as by default each note has level 0.

This should be enhanced, so that the second note is placed on level higher next to the other note instead.

Idea: Use level:auto as default and then try to calculate the levels automatically.
Maybe the level argument can be removed completely and the order is always based on the position of the note field.