Add density cutoff option to fix FDBM for all-electron densities. #881

Job	Run time
Test docker image on ubuntu-latest	2m 0s
test-package (3.8)	12m 19s
test-package (3.9)	11m 20s
test-package (3.10)	11m 12s
test-package (3.11)	10m 39s
test-package (3.12)	11m 51s
	59m 21s

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