fix(hierarchical): ignore invisible nodes #270
Merged
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The layout originally made space for invisible nodes (for example after clustering). Now it takes into account only the nodes that are actually rendered solving the problems with sometimes huge empty spaces in hierarchies with clusters.
Also the Hierarchical Layout Methods example was modified to show clustering. It was actually mostly rewritten with new design, various code style improvements and more detailed info added atop of clustering.
PS: Merge #268 into this branch to make the errors go away.