#3 funpdbe schema compliance

Conversion output of xml2json fails during schema validation. It needs some bugfixes.

fixed by commits https://git.enzim.ttk.hu/data/PDBe/commit/17dd0ea783f63a5feb892bcb045ea2d388607e2f https://git.enzim.ttk.hu/data/PDBe/commit/f60d01e5805c27db6dc0a8ff1b400b2f213ac703 https://git.enzim.ttk.hu/data/PDBe/commit/32a05f6187976310c7c41e0de06f176a61180a5f