Deactivate premature code in state
Save artificial nodes in xml documents
Retrieve artificial Tokens
Fetch artificial tokens on init in aT
Don't delete inexistant nodes in dependencyTree
Pass an id mappings to tokens in tokenRetriever
Move idMap to idHandler
Update treebankPersister specs
Add idHandler.transformtoSourceIds

Takes tokens and an docIdentifier, returns an object with mappings to
the source document and an array with unmapped tokens.
Add idMap to ArtificialTokens
Used mapped ids to save in treebankPersister
Create ids for unmapped tokens up front...

where up front means before we start to update tokens in a document.
Otherwise we cannot map head ids!
Fix init in depTree
Use head id mappings in treebankRetriever
Delete removed tokens from xml document