MWE lemma heuristics: use goeswith

[nschneid]

We annotate MWEs where there are superfluous authorial spaces ("miss informed", "mean time"), but the lemma retains the space. The UD relation goeswith should be exploited to delete the space. We should also consider enforcing consistency between the MWE annotation and goeswith; right now there are goeswith annotations without corresponding MWE annotations.