Group pie charts' transactions by positive or negative groups; fixes #657

5 jobs for grouped-pie-charts in 1 minute (queued for 1 second)
Status Name Job ID Coverage
  Lint
failed lint #38970

00:01:00

 
  Build
skipped build #38971
 
  Test
skipped lint_history #38974
skipped npm #38973
skipped test #38972
 
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