Enhance pension calculation and clean #64

Job	Run time
test-path-length	14s
build (ubuntu-20.04, 3.9.9, minimal)	54s
build (ubuntu-20.04, 3.9.9, maximal)	48s
build (ubuntu-20.04, 3.10.6, minimal)	52s
build (ubuntu-20.04, 3.10.6, maximal)	54s
test-python (ubuntu-20.04, 3.9.9, minimal)	20s
test-api (maximal)	25s
test-yaml (2, 0, minimal)	28s
test-python (ubuntu-20.04, 3.9.9, maximal)	22s
lint-files (maximal)	28s
test-yaml (2, 0, maximal)	29s
test-python (ubuntu-20.04, 3.10.6, minimal)	26s
test-yaml (2, 1, minimal)	28s
test-python (ubuntu-20.04, 3.10.6, maximal)	23s
test-yaml (2, 1, maximal)	24s
check-version-and-changelog	0s
check-for-functional-changes	0s
deploy	0s
	7m 55s

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