group defaults to 1, group support for points etc

[tdhock]

this is faster than the previous code which used 1:N

[tdhock]

No obvious timing issues in HEAD=group-default-1

Generated via commit 2689874

Download link for the artifact containing the test results: ↓ atime-results.zip

Task	Duration
R setup and installing dependencies	2 minutes and 25 seconds
Installing different package versions	29 seconds
Running and plotting the test cases	4 minutes and 19 seconds

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.71%. Comparing base (ca6f5c6) to head (2689874).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
- Coverage   77.75%   77.71%   -0.04%     
==========================================
  Files         164      164              
  Lines        8802     8788      -14     
  Branches      574      574              
==========================================
- Hits         6844     6830      -14     
  Misses       1958     1958              

Flag	Coverage Δ
javascript	95.37% <ø> (ø)
r	69.51% <100.00%> (-0.08%)	⬇️

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