Feat/tree functions

[micmitch]

The addition of several functions from @jcapriot to make it easier to work with octree meshes. Several of the functions are used to integrate line source terms for FDEM. Other improvements include updating documentation and improving plotGrid to visualize octree meshes and models.

[codecov]

Codecov Report

Merging #177 into master will decrease coverage by 0.65%.
The diff coverage is 41.53%.

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
- Coverage   81.02%   80.36%   -0.66%     
==========================================
  Files          23       23              
  Lines        4848     5328     +480     
==========================================
+ Hits         3928     4282     +354     
- Misses        920     1046     +126

Impacted Files	Coverage Δ
discretize/TensorMesh.py	75.92% <0%> (ø)	⬆️
discretize/View.py	75.34% <100%> (+3.02%)	⬆️
discretize/TreeMesh.py	40.9% <42.01%> (-6.51%)	⬇️
discretize/utils/codeutils.py	95.45% <0%> (-4.55%)	⬇️
discretize/utils/matutils.py	92.9% <0%> (-2.03%)	⬇️
discretize/mixins/vtkModule.py	79.92% <0%> (-0.44%)	⬇️
discretize/utils/meshutils.py	89.33% <0%> (-0.37%)	⬇️
discretize/mixins/__init__.py	61.9% <0%> (+1.9%)	⬆️
discretize/base/base_mesh.py	81.93% <0%> (+2.49%)	⬆️

---

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[codecov]

Codecov Report

Merging #177 into master will decrease coverage by 1.15%.
The diff coverage is 41.53%.

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
- Coverage    83.1%   81.94%   -1.16%     
==========================================
  Files          23       23              
  Lines        4894     4974      +80     
==========================================
+ Hits         4067     4076       +9     
- Misses        827      898      +71

Impacted Files	Coverage Δ
discretize/TensorMesh.py	80.55% <0%> (ø)	⬆️
discretize/View.py	73.09% <100%> (+0.03%)	⬆️
discretize/TreeMesh.py	57.27% <42.01%> (-11.66%)	⬇️
discretize/utils/codeutils.py	82.85% <0%> (-2.86%)	⬇️
discretize/utils/matutils.py	92.9% <0%> (-2.03%)	⬇️
discretize/utils/meshutils.py	93.01% <0%> (-0.37%)	⬇️

---

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[lheagy]

Many thanks for all of the docstrings! This is looking good. I have just merged the latest master and will see what happens with the testing. It looks like the previous fail was due to python 2.7. If it is still the case, I am totally fine dropping the python 2.7 testing and noting that we no longer explicitly support 2.7 rather than going hunting for the issue.

@jcapriot, @micmitch were there any other updates you wanted to make before we merge this in?

[lheagy]

Thanks for the doc-strings :)

[jcapriot]

I don't have any more local things left on this so I'm good to pull this in

[lheagy]

It seems that only python 2.7 is giving issues here. I am inclined to just remove testing and indicate that we no longer explicitly support python 2.7. Are there any concerns with this?