Export annotations to neuroglancer info files

[jefferis]

No description provided.

[codecov]

Codecov Report

Merging #173 (b0b63f0) into master (7d8a4c9) will increase coverage by 0.24%.
The diff coverage is 87.50%.

❗ Current head b0b63f0 differs from pull request most recent head 0066161. Consider uploading reports for the commit 0066161 to get more accurate results

@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
+ Coverage   53.41%   53.66%   +0.24%     
==========================================
  Files          36       37       +1     
  Lines        4431     4463      +32     
==========================================
+ Hits         2367     2395      +28     
- Misses       2064     2068       +4     

Impacted Files	Coverage Δ
R/flytable.R	68.24% <50.00%> (-0.08%)	⬇️
R/nginfo.R	90.00% <90.00%> (ø)

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