WIP read in metadata

[jefferis]

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[codecov]

Codecov Report

Merging #487 (c83ef57) into master (bcdbfd2) will decrease coverage by 1.15%.
The diff coverage is 74.07%.

@@            Coverage Diff             @@
##           master     #487      +/-   ##
==========================================
- Coverage   76.84%   75.68%   -1.16%     
==========================================
  Files          47       48       +1     
  Lines        5894     5923      +29     
==========================================
- Hits         4529     4483      -46     
- Misses       1365     1440      +75     

Impacted Files	Coverage Δ
R/neuron-io.R	82.52% <74.07%> (-2.64%)	⬇️
R/neuronlistfh.R	48.94% <0.00%> (-30.53%)	⬇️
R/xform.R	58.33% <0.00%> (-17.99%)	⬇️
R/amiralandmarks-io.R	81.48% <0.00%> (-9.26%)	⬇️
R/neuron.R	83.65% <0.00%> (-0.05%)	⬇️
R/xyzmatrix.R	91.05% <0.00%> (ø)
R/ngraph.R	87.63% <0.00%> (+0.06%)	⬆️
R/hxsurf.R	91.15% <0.00%> (+0.10%)	⬆️

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