need nixio, odml,
https://github.com/G-Node/python-odml
https://github.com/G-Node/nix-odML-converter
mostly download all and install with command "python setup.py install"
update metadata to newest version with https://github.com/G-Node/python-odml/tree/master/odml/scripts/odml_to_rdf
create metadata nix from xml metadata with nix-odml (convert_odml_to_nix)
add data to created nix file with convert_bv_to_nix
TODO fix brain vision loader / parser