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(Windows) 'Sys.info()' was out of step with 'win.version()' and did not report Windows 8.
'topenv(baseenv())' returns 'baseenv()' again as in R 3.1.0 and earlier. This also fixes 'compilerJIT(3)' when used in '.Rprofile'.
'detach()'ing the 'methods' package keeps '.isMethodsDispatchOn()' true, as long as the methods namespace is not unloaded.
'model.tables(type = "means")' and hence 'TukeyHSD()' now support '"aov"' fits without an intercept term. (PR#16437)