use fgets() results when reading .mesh files, plus language fixes #22

Job	Run time
mmg-debug / ci (ubuntu-20.04, on, off, on, off, int32_t)	1h 17m 55s
mmg-debug / ci (ubuntu-20.04, on, off, off, off, int32_t)	1h 40m 11s
mmg-debug / ci (ubuntu-20.04, off, off, on, off, int32_t)	1h 1m 24s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int32_t)	1h 9m 42s
mmg-debug / ci (macos-12, on, off, on, off, int32_t)	41m 21s
mmg-debug / ci (macos-12, on, off, off, off, int32_t)	1h 5m 43s
mmg-debug / ci (macos-12, off, off, on, off, int32_t)	38m 8s
mmg-debug / ci (macos-12, off, off, off, off, int32_t)	39m 4s
mmg-debug / ci (ubuntu-20.04, off, off, off, on, int32_t)	3m 29s
mmg-debug / ci (macos-12, off, off, off, on, int32_t)	6m 57s
mmg-debug / ci (ubuntu-20.04, off, on, on, off, int32_t)	1h 2m 30s
mmg-debug / ci (macos-12, off, on, on, off, int32_t)	34m 0s
mmg-debug / ci (windows-2022, off, off, off, off, int32_t)	55m 33s
mmg-debug / ci (windows-2022, on, off, off, off, int32_t)	53m 40s
mmg-debug / ci (windows-2022, off, on, off, off, int32_t)	54m 13s
mmg-debug / ci (ubuntu-20.04, on, on, on, on, int64_t)	4m 4s
mmg-debug / ci (ubuntu-20.04, off, off, on, on, int64_t)	1h 9m 41s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int64_t)	1m 43s
mmg-debug / ci (macos-12, on, on, on, on, int64_t)	7m 56s
mmg-debug / ci (macos-12, off, off, off, off, int64_t)	4m 4s
mmg-debug / ci (windows-2022, on, on, off, off, int64_t)	5m 9s
mmg-debug / ci (windows-2022, off, off, off, off, int64_t)	4m 46s
mmg-debug / upload_coverage	1m 47s
	14h 23m 0s

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