53fa4801a0
Particle copying code was already properly sharing pointcache between orig data and its copy only when `LIB_ID_COPY_SET_COPIED_ON_WRITE` is set, do the same for the other point cache users. Using `LIB_ID_CREATE_NO_MAIN` here is waaaaaaay to much wide scope for such a dangerous/advanced behavior, that kind of things has to be strictly restricted in scope.