#74 Kartierabschnitt: The selection of the unratable checkbox disappears, if not every sohlsubstrat has the value zero.
 So every sohlsubstrat should set to zero, after the unratable checkbox was selected.
#74 every text field with a double value should be shown with at least one decimal place
Merge branch 'bug/74_unratable_selection_disappears' into dev