add ind= to choose{CRAN,BioC}mirror

git-svn-id: https://svn.r-project.org/R/trunk@62399 00db46b3-68df-0310-9c12-caf00c1e9a41
need shell escape

git-svn-id: https://svn.r-project.org/R/trunk@62400 00db46b3-68df-0310-9c12-caf00c1e9a41