Implement #25 - Expand/hide all button#44

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Stromwerk wants to merge 2 commits intomlrv:masterfrom Stromwerk:#25-expand-all

+57-5

Commits on Jan 21, 2020

Fix mlrv#24 Table not updating after tree has changed
Stromwerk
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Implement mlrv#25 - Expand/hide all button
Stromwerk
committed