Add smooth cutoffs to distance tolerances #120

Job	Run time
Build and test in release mode (ubuntu-latest, gcc, 13)	51s
Build and test in release mode (macos-latest, gcc, 13)	50s
Build and test in debug mode (ubuntu-latest, gcc, 14)	50s
Build and test in debug mode (ubuntu-latest, gcc, 13)	52s
Build and test in debug mode (macos-latest, gcc, 14)	44s
Build and test in debug mode (macos-latest, gcc, 13)	50s
	4m 57s

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