dlr-navteq output should not trigger numerical ids

[behrisch]

[namdre]

geometry changes in the roundtrip network result comes from differences in writing geometries with spreadType right/center depending on the presence of negated edge ids.
option --numerical-ids was destroying some id/-id pairs which caused writing style "center", without numerical ids the edge pair 1#2,-1#2 retains it's relationship and is written in style "right". This also affects the network boundary and net offset.