Add smooth cutoffs to distance tolerances #117

Job	Run time
Build and test in release mode (macos-latest, gcc, 13)	46s
Build and test in debug mode (ubuntu-latest, gcc, 13)	55s
Build and test in debug mode (macos-latest, gcc, 13)	52s
Build and test in debug mode (ubuntu-latest, gcc, 14)	59s
Build and test in debug mode (macos-latest, gcc, 14)	1m 1s
Build and test in release mode (ubuntu-latest, gcc, 13)	55s
	5m 28s

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