Aggregator functionality

[JessedeDoes]

Is still rather limited (cf. also issue about figuring out the status)

• Show metadata if a metadata dataview is included in results
• Metadata search
• Number of results
• Run and export complete query result (slow in fcs but possible)
• show translation of UD query to corpus-specific; if possible link to query execution in corpus (possible for blacklab-server-based corpora; also for Nederlab), so user can go there and tune query and do nicer things with the query results
• Kwic view highlights only first word of hit
• Advanced data view not readable

[peterdekker]

For now, we will use the aggregator as it is