Fix problems with extra triangles in input mesh #189

Job	Run time
parmmg-debug / ci (ubuntu-20.04, on, on, on, off)	50m 23s
parmmg-debug / ci (ubuntu-20.04, on, on, off, off)	38m 31s
parmmg-debug / ci (ubuntu-20.04, on, off, on, off)	50m 3s
parmmg-debug / ci (ubuntu-20.04, on, off, off, off)	37m 13s
parmmg-debug / ci (ubuntu-20.04, off, on, on, off)	51m 9s
parmmg-debug / ci (ubuntu-20.04, off, on, off, off)	39m 37s
parmmg-debug / ci (ubuntu-20.04, off, off, on, off)	52m 8s
parmmg-debug / ci (ubuntu-20.04, off, off, off, off)	40m 28s
parmmg-debug / ci (macos-12, on, on, on, off)	56m 3s
parmmg-debug / ci (macos-12, on, on, off, off)	24m 39s
parmmg-debug / ci (macos-12, on, off, on, off)	50m 1s
parmmg-debug / ci (macos-12, on, off, off, off)	29m 0s
parmmg-debug / ci (macos-12, off, on, on, off)	51m 17s
parmmg-debug / ci (macos-12, off, on, off, off)	26m 12s
parmmg-debug / ci (macos-12, off, off, on, off)	53m 45s
parmmg-debug / ci (macos-12, off, off, off, off)	23m 50s
parmmg-debug / ci (ubuntu-20.04, off, off, off, on)	1h 7m 39s
parmmg-debug / ci (ubuntu-20.04, off, off, on, on)	1h 5m 8s
parmmg-debug / ci (macos-12, off, off, off, on)	30m 32s
parmmg-debug / upload_coverage	43s
	13h 58m 21s

Provide feedback