floras tests in PDM env - MacOS

fix tests, update installation instructions, add case study #12

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Run time

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Job	Run time
Build and test (macos-latest, 3.10)	11m 45s
Build and test (macos-latest, 3.11)	11m 45s
Build and test (macos-latest, 3.12)	10m 9s
	33m 39s