Skeleton segments

[ceesem]

Two improvements.

1) Mesh masking uses a trimesh-native approach that significantly speeds up the mask-based reindexing. 2) Exposes/allows a few new features of the skeleton graph, such as snipping graphs at a point, parent and child node look-ups, and better nomenclature for sets of covering paths. These are useful for other skeleton computations.

This does have a small breaking change in the order of arguments to trimesh_vtk.linked_point_actor, which no longer needs indices.

[codecov-io]

Codecov Report

Merging #24 into master will increase coverage by 1.38%. The diff coverage is 93.67%.

@@            Coverage Diff            @@
##           master     #24      +/-   ##
=========================================
+ Coverage   74.71%   76.1%   +1.38%     
=========================================
  Files          11      11              
  Lines        1677    1695      +18     
=========================================
+ Hits         1253    1290      +37     
+ Misses        424     405      -19

Impacted Files	Coverage Δ
meshparty/skeleton_io.py	89.15% <100%> (ø)	:arrow_up:
meshparty/trimesh_io.py	74.82% <100%> (+0.11%)	:arrow_up:
meshparty/trimesh_vtk.py	79.92% <20%> (-1.15%)	:arrow_down:
meshparty/skeleton.py	96.15% <97.82%> (+11.77%)	:arrow_up:

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[fcollman]

need tests for the new functionality

[fcollman]

looks good to me!