Fix copy and paste problem.

git-svn-id: https://svn.r-project.org/R/trunk@63945 00db46b3-68df-0310-9c12-caf00c1e9a41
tweaks to match R-patched

git-svn-id: https://svn.r-project.org/R/trunk@63947 00db46b3-68df-0310-9c12-caf00c1e9a41
back out r63942: breaks packages

git-svn-id: https://svn.r-project.org/R/trunk@63948 00db46b3-68df-0310-9c12-caf00c1e9a41
getParseData did not show the 'i' in parsing imaginary constants.

git-svn-id: https://svn.r-project.org/R/trunk@63949 00db46b3-68df-0310-9c12-caf00c1e9a41
dbeta could undeflow and infinite-loop

git-svn-id: https://svn.r-project.org/R/trunk@63950 00db46b3-68df-0310-9c12-caf00c1e9a41