Added atmospheric drag effect for Brouwer-Lyddane model.

Fixes #871
2 jobs for issue-871 in 18 minutes and 49 seconds (queued for 8 seconds)
latest
Status Name Job ID Coverage
  Verify
passed verify #3354

00:18:20

 
  Visualize
passed coverage-import #3355

00:00:29

97.0%