power.t.test() - uniroot now searches further

git-svn-id: https://svn.r-project.org/R/trunk@67205 00db46b3-68df-0310-9c12-caf00c1e9a41
R_loadMethod() cosmetic: saving a UNPROTECT / PROTECT in the non-trivial case


git-svn-id: https://svn.r-project.org/R/trunk@67207 00db46b3-68df-0310-9c12-caf00c1e9a41