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968bddcd4b
If you do `malloc(100)` followed by `realloc(200)`, DHAT now adds 100 bytes to the read and write counts for the implicit `memcpy`. This gives more reasonable results. I have long been surprised by low writes-per-byte values of around 0.35 for vectors that are grown by doubling. Counting the implicit `memcpy` increases those numbers to well above 0.5, which is what you'd expect. The commit also adds a section to the DHAT docs about `realloc`, because there is some non-obvious behaviour, some of which confused me just a couple of days ago.