Improve `case_input.nc` output handling#2

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Sandro-Meier-Empa wants to merge 3 commits into

microhh:mainfrom

Sandro-Meier-Empa:feature-improved-io-handling

Commits on May 12, 2026

keep xr dataarray attributes when creating initial conditions
Sandro-Meier-Empa
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add argument to overwrite existing input file
Sandro-Meier-Empa
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Commits on Jun 4, 2026

pass string of posix path to netCDF4.Dataset to ensure compatibility
Sandro-Meier-Empa
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