New mcrun/mxru feature: 'scan' seeds during a scan series using --see… #419

Job	Run time
macos-latest.mpich.python-3.12	4m 19s
windows-latest.msmpi.python-3.12	9m 32s
ubuntu-latest.openmpi.python-3.12	3m 43s
ubuntu-latest.mpich.python-3.12	3m 26s
macos-latest.openmpi.python-3.12	4m 20s
	25m 20s

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