Add multimat mode to ls split #261

Job	Run time
parmmg-debug / ci (ubuntu-20.04, on, on, on, off)	50m 7s
parmmg-debug / ci (ubuntu-20.04, on, on, off, off)	37m 17s
parmmg-debug / ci (ubuntu-20.04, on, off, on, off)	52m 25s
parmmg-debug / ci (ubuntu-20.04, on, off, off, off)	40m 5s
parmmg-debug / ci (ubuntu-20.04, off, on, on, off)	50m 41s
parmmg-debug / ci (ubuntu-20.04, off, on, off, off)	38m 35s
parmmg-debug / ci (ubuntu-20.04, off, off, on, off)	57m 26s
parmmg-debug / ci (ubuntu-20.04, off, off, off, off)	44m 24s
parmmg-debug / ci (macos-12, on, on, on, off)	46m 56s
parmmg-debug / ci (macos-12, on, on, off, off)	6h 0m 16s
parmmg-debug / ci (macos-12, on, off, on, off)	47m 57s
parmmg-debug / ci (macos-12, on, off, off, off)	17m 24s
parmmg-debug / ci (macos-12, off, on, on, off)	47m 53s
parmmg-debug / ci (macos-12, off, on, off, off)	6h 0m 15s
parmmg-debug / ci (macos-12, off, off, on, off)	48m 53s
parmmg-debug / ci (macos-12, off, off, off, off)	18m 38s
parmmg-debug / ci (ubuntu-20.04, off, off, off, on)	1h 9m 1s
parmmg-debug / ci (ubuntu-20.04, off, off, on, on)	1h 9m 4s
parmmg-debug / ci (macos-12, off, off, off, on)	26m 12s
parmmg-debug / upload_coverage	0s
	1d 0h 43m 29s

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