tracking sentence labels through parsing and regeneration

[dmhowcroft]

The default build scripts for working with CCGbank (e.g. build-ps.xml) label sentences based on their position in the file (e.g. the sentence on the 10th line of the file is labelled s10).

• check if there is already a way to pass labels in through these scripts to associate them with input texts through the full pipeline
• if there is not, modify the code to incorporate the change