I/O metadata for generate_matrix

Fixes #15 (closed)

added 4 commits

• 36c183ef...287de879 - 2 commits from branch ghsc/geomag:master
• 743b7f83 - i/o metadata for generate_matrix
• b6d434f2 - Ensure valid readings

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added 1 commit

• a6f9299e - print result, save file as json, set metadata start/end times with result

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added 1 commit

• b08a989e - cast to list in adjusted package, store reading times in comment

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added 1 commit

• a686fc91 - Add quiet option, enumerate factories, set update interval to none

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resolved all threads

mentioned in commit 5f257571

merged