Various fixes for layout, drag-and-drop#69

Merged

texodus merged 10 commits intomasterfrom layout-fixes

Mar 12, 2018

+139-101

Commits on Mar 12, 2018

Fixed drag-and-drop behavior to accomadate padding in drag area.
texodus
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Changed column proportions to make large column sets more readable.
texodus
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Make update behavior scheduling asynchronous.
texodus
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Fixed drag-and-drop bounds checking with respect to padding.
texodus
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Re-center color range on heatmaps when all values are the same sign; fixed reset() method to properly set 'columns' and 'index' attributes.
texodus
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Added esoteric timestamp parse candidate to perspective.
texodus
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Fixed viewer task cancellation race condition.
texodus
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Fixed chart race condition which caused some chart settings to not be applied on heavy charts.
texodus
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Changed default sort order of inactive columns.
texodus
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Fixed tests.
texodus
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