Dendrogram selection in 3D volume viewer#172

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PennyQ wants to merge 7 commits intoglue-viz:masterfrom PennyQ:dendro_3dselection

+97-19

Commits on Oct 31, 2016

implement dendrogram except get dendro structure
PennyQ
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add 3D dendrogram selection but not got dendrogram data
PennyQ
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modity the client data
PennyQ
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rebase with point mode but dendrogram selection not get shown
PennyQ
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add comment
PennyQ
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fix dendrogram selection in 3d
PennyQ
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polish code
PennyQ
committed