[DOC] Removed the 'function' type from 'valuesAnchor' properties.
[DOC] Added 'stacked' properties to non-stacked Point charts, but fixed to false.
[DOC][FEAT] Added PropertyType/@level attribute to the schema, with values "basic", "intermediate" and "advanced" (the default). "Filled in" basic properties.
[DOC][FIX]  Default value of 'measuresIndexes' property.