In case the xces document contains sentences with no chunk containing them, a fake chunk will be created to hold the sentences.
Previously this situation threw an exception.

add disamb-ignoring equality
use both of these in Token's remove duplicate lexemes to mEdukacjaWeb/bilanse.do?event=switchBilanse&bilanse=prognozowaneake disamb take priority in case of a disamb/ndisamb dupe

Libcorpus2 now contains the base strructures (tokens etc), their I/O and related classes.
Libpwrutils (name TBD) contains basic building blocks common to all tagger-related libraries
Tagset-tool only needs libcorpus, so was brough here as well.