Merge branch '553-change-arrows-for-transcription-starting-sites' into 'master'

Resolve "change arrows for Transcription Starting Sites"

Closes #553

See merge request !491
17 jobs for 552-conversion-to-sbml-and-to-image in 8 minutes and 33 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed dependency_conflict_check #37394

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passed test_backend 10 15 #37388

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passed test_backend 11 15 #37389

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passed test_backend 1 15 #37379

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passed test_backend 12 15 #37390

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passed test_backend 13 15 #37391

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passed test_backend 14 15 #37392

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passed test_backend 15 15 #37393

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passed test_backend 2 15 #37380

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passed test_backend 3 15 #37381

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passed test_backend 4 15 #37382

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passed test_backend 5 15 #37383

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passed test_backend 6 15 #37384

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passed test_backend 7 15 #37385

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passed test_backend 8 15 #37386

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passed test_backend 9 15 #37387

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passed test_frontend #37378

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