chore: update arpack to arpack-ng 3.9.1 #1559
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@krlmlr You asked to update ARPACK to the latest ARPACK-NG. This PR attempts to do that. It was quite painful: first we need to rename functions to have an igraph prefix, and avoid conflicts. This can be done automatically. But then the line lengths exceed 72 characters, which is the maximum for fixed-form Fortran, and we need to manually reformat them, with the appropriate continuation character. I hope I didn't mess this up.
The changes to snapshots are fine. But there's a failure with spectral clustering, and it's unclear to me whether that's a real failure or not. I'll have another look at this when teaching is over (mid-November).