multiple root nodes

[MatPopp]

• in order to showcase the connection between two (or more) terms

[simontaurus]

https://github.com/OpenSemanticLab/mediawiki-extensions-InteractiveSemanticGraph/commit/4d1ab52aa20c335ccebde25c370e7c4035011115 allows at least a manual added second "root" node by selecting an existing term

[MatPopp]

solved by search function for insert node