Display non-page properties within nodes rather than as edges

[alex-mashin]

This PR is made in reference to: #667

Example:

{{#ask:[[Property:+]] [[Creation date::+]]<!-- to exclude subobjects -->
| ?Subproperty of
| ?Has type#Type
| format = graph
| parent = Subproperty of
| limit = 2000
| rankdir = RL
| graphlink = yes
| nodeshape = Mrecord
| graphlegend = yes
| graphcolor = yes
}}

will display nodes like this:

+-------------------+
| Is predecessor of |
| ----------+------ |
| Type      | Page  |
+-------------------+

and the edges will point to the parent properties.

[JeroenDeDauw]

Please add a short one line to https://github.com/SemanticMediaWiki/SemanticResultFormats/blob/master/RELEASE-NOTES.md

[alex-mashin]

Please add a short one line to https://github.com/SemanticMediaWiki/SemanticResultFormats/blob/master/RELEASE-NOTES.md

Added.