[R] giving priority to stats package

[Gabor Grothendieck]

library and require have new args in 3.6 giving additional control
over conflicts.  This seems very useful but I was wondering if there
were some, preferabley simple, way to give existing loaded packages
priority without knowing the actual conflicts in advance.  For example

    library(dplyr, exclude = c("filter", "lag"))

works to avoid masking those names in stats that would otherwise be
masked by that package but I had to know in advance that filter and
lag were the conflicting names.

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