Germeval2014 NER competition category and tag definitions and loader

Dear all,

For the GermEval2014 NER competition (two-level nested NER) I added tag definitions to NerTag.scala and added a LoaderGermeval2014.scala program.

I represent the two levels as separate labelled variables and not as a cross-product (as in LoadConnl2000.scala) because 1) the domain has already 49 tags for one level  and 2) I will create factor graphs that treat the levels as distinct sets of variables.

Best,
Peter