Final checks / modifications before submitting to CRAN #160

Job	Run time
build-pkg	4m 48s
ubuntu-latest (devel) (valgrind:)	20m 41s
windows-latest (release) (valgrind:)	10m 29s
ubuntu-latest (devel) (valgrind:true)	38m 5s
macOS-latest (devel) (valgrind:)	20m 33s
macOS-latest (release) (valgrind:)	5m 48s
ubuntu-latest (release) (valgrind:)	6m 4s
	1h 46m 28s

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