Memory access checking

Bump tarball version to 4.5.0 and update NEWS. #436

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Run time

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Job	Run time
skip_duplicates	5s
Valgrind (gcc)	8m 31s
ASan-UBSan (gcc)	3m 6s
Valgrind (clang)	7m 50s
ASan-UBSan (clang)	2m 55s
	22m 27s