Save cube's mappings
Make modeler a slicer command (new command API prototype)
Added model/info + separate JSON editor
preliminary addition of mappings to the attribute base
Nicer attribute list editor (more consistent with others)
Added cube detail attribute list editor
Use 'detail' in join (fix)
Show join editor only if a join is selected
Use new global (root scope) variable to determine mapping type
Added /info route
Added new directive <json-editor>; added __model_options__ (now accepts --store_type argument)
Don't include group-by part in summary only selects