Depth by length; compareEdge option; options to trace #4

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lpw wants to merge 4 commits intokeithwhor:masterfrom

Commits on Mar 20, 2017

allow search depth limits by length as well as distance.
Lance Welsh
committed
Added compare/passConditions for edges and a stricter one for nodes.
Lance Welsh
committed
Allow Graph's trace to have the same options as closest
Lance Welsh
committed

Commits on May 3, 2017

Seek some performance improvements
Lance Welsh
committed