Memory efficient working practices

[wjchulme]

Below is some rough guidance on reducing memory usage for scripted actions. The focus is on R but many of the principles apply to Python and Stata. h/t to @robinyjpark

---

Now moved to its own documentation page.

[wjchulme]

This info and more is now available in the documentation, see https://docs.opensafely.org/memory-efficient-working/