- remove unused is_primary from person_key - remove unused node_attributes - clarify attributes comments; should probably rename table to   slice_attribute_types
- remove unused is_primary from person_key
- remove unused node_attributes
- clarify attributes comments; should probably rename table to
  slice_attribute_types


dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi