Fix problems with extra triangles in input mesh #137

Job	Run time
parmmg-debug / ci (ubuntu-20.04, on, on, on, off)	1m 49s
parmmg-debug / ci (ubuntu-20.04, on, on, off, off)	1m 54s
parmmg-debug / ci (ubuntu-20.04, on, off, on, off)	1m 27s
parmmg-debug / ci (ubuntu-20.04, on, off, off, off)	1m 28s
parmmg-debug / ci (ubuntu-20.04, off, on, on, off)	1m 47s
parmmg-debug / ci (ubuntu-20.04, off, on, off, off)	2m 4s
parmmg-debug / ci (ubuntu-20.04, off, off, on, off)	1m 21s
parmmg-debug / ci (ubuntu-20.04, off, off, off, off)	1m 23s
parmmg-debug / ci (macos-12, on, on, on, off)	2m 38s
parmmg-debug / ci (macos-12, on, on, off, off)	3m 20s
parmmg-debug / ci (macos-12, on, off, on, off)	1m 44s
parmmg-debug / ci (macos-12, on, off, off, off)	2m 8s
parmmg-debug / ci (macos-12, off, on, on, off)	2m 33s
parmmg-debug / ci (macos-12, off, on, off, off)	3m 32s
parmmg-debug / ci (macos-12, off, off, on, off)	1m 59s
parmmg-debug / ci (macos-12, off, off, off, off)	2m 20s
parmmg-debug / ci (ubuntu-20.04, off, off, off, on)	1m 41s
parmmg-debug / ci (ubuntu-20.04, off, off, on, on)	1m 29s
parmmg-debug / ci (macos-12, off, off, off, on)	1m 51s
	38m 28s

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