Fingering positioning

[Davide Castellone]

Fingerings in Lilypond avoid staff lines, but this can lead to a confusing 
output. In the example below we can't understand which staff the '5' belong to. 
Is there a way to switch this behaviour off?
P.S. There is no space to put the fingerings above the first staff and below 
the second (this would increase the number of pages).

Thanks,
Davide

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