patched histology blocks worklist to hide non-block/slide sample types; 1 new & 1 renamed field for genomics, returned additional_samples to SpecimensBlood for legacy ppm xml validation

new barcodes function; re-arranged get_object_by_param() to accept simpler 2-element args (then didn't use it for barcodes function); bugfix to genomics xml validator & generator scripts - method of camelcasing section_name altered original array after 1st cycle of loop; EQA samples flagged as ST for billing; extended xsd for cancer dataset