Pull request ElementsProject/lightning#4521

Inflights ordering, crashfix

6664
6680
6681
6709
6733
6734
6737
6742

Range Diff Matrix


6664..6680
6664..6681	6680..6681
6664..6709	6680..6709	6681..6709
6664..6733	6680..6733	6681..6733	6709..6733
6664..6734	6680..6734	6681..6734	6709..6734	6733..6734
6664..6737	6680..6737	6681..6737	6709..6737	6733..6737	6734..6737
6664..6742	6680..6742	6681..6742	6709..6742	6733..6742	6734..6742	6737..6742