Add density cutoff option to fix FDBM for all-electron densities. #850

Job	Run time
Test docker image on ubuntu-latest	2m 0s
test-package (3.8)	5m 40s
test-package (3.9)	5m 32s
test-package (3.10)	5m 17s
test-package (3.11)	5m 14s
test-package (3.12)	5m 49s
	29m 32s

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