Update ip_points_association_nn, ip_curve_fitting, ip_spot_detection_2d: Employ required_files, changes output formats tsv to tabular

[kostrykin]

Update ip_points_association_nn, ip_curve_fitting, ip_spot_detection_2d tools:

• Employ required_files Employ <required_files> where it is missing #215
• Change output formats from tsv to tabular (ip_spot_detection_2d already was tabular)

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Please make sure you have read the CONTRIBUTING.md document (last updated: 2025/12/22).

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