ENH: Check for existing PV output files before generation #164
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This change improves the robustness of the partial volume generation error checking to avoid overwriting existing results. The provided output paths are checked before the routine is run, and if they contain any existing files, the user is prompted whether to continue.
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Addresses TODO in #138 (comment).
This change improves the error checking for partial volume generation by warning the user before (potentially) overwriting existing results in the output directories. The provided output paths are checked before the PV generation routine is run so that if the subdirectories contain any existing files, the user is prompted whether or not to continue.