mirrors <- NULL
mirrors <- c(mirrors,CRAN='http://cran.r-project.org')
-mirrors <- c(mirrors,BioC='http://www.bioconductor.org/packages/2.12')
+mirrors <- c(mirrors,BioC='http://www.bioconductor.org/packages/3.1')
mirrors <- c(mirrors,Omegahat="http://www.omegahat.org/R/src/contrib")
verbose<-TRUE