add extra byte for null termination when reading attributes
add extra byte for null termination when reading attributes

chrisemblhh/nexus,nexusformat/code,chrisemblhh/nexus,chrisemblhh/nexus,chrisemblhh/nexus,nexusformat/code,nexusformat/code,chrisemblhh/nexus,nexusformat/code,nexusformat/code