regression: predefined queries cannot be edited
added target datasets to queries
query datasets now are summary subtitles (still read-only)
Merge branch 'master' of
https://github.com/gradesystem/grade-console.git

Conflicts:
	lib/common/queries/queries_model.dart
	lib/common/queries/query_details.dart
	lib/common/queries/query_details_summary.dart