Remove gql module's dependency on query. Make it the other way round. GraphQL query string, now gets converted into query.SubGraph as an additional step run via query.ToSubGraph.

Use cache for streaming entries instead of opening files for each posting list. Use iterator instead of channel while streaming entries.

Real world use cases. Allow for dots in names. Handle backspace. Run automatic mutation merging. Load multiple rdf gzips, etc.

Handle reading rdf data from files. Use underscores for uid and xid, keeping it in sync with internal usage. Output uids as hex.