added abbreviated nt export format

note to self: this needs major rework, formats
should be more separated from the overall processing

difference is mainly that json and xml look better
without the embellishments (^^, @, ", <>, ...) while
nt and tsv need to keep those - I think.
prefix rearrangements

targeted toward some interface, where the user
actually needs to enter some entity --

this will likely change a few more times until it's stable