adjusting testMapSToken and testMapSeveralTokenizations to new relannis spec
adjusting testMapSToken and testMapSSyntax to new relannis spec
adjusting testMapSToken and testMapAnaphoric to new relannis spec
don't forget to set SDocument in test
don't compile on save
restructured the SRelation2RelANNISMapper handling of virtual nodes

the old implementation did not work with dominance edges or subcomponents
use IDs instead of SNode at several places to allow usage of virtualized target nodes