update

git-svn-id: https://svn.r-project.org/R/trunk@66697 00db46b3-68df-0310-9c12-caf00c1e9a41
fix bug 15899: hist(x, <few extreme breaks>)

git-svn-id: https://svn.r-project.org/R/trunk@66698 00db46b3-68df-0310-9c12-caf00c1e9a41