init_packages.R: enhance to the R script

[laurivesa]

add one new argument (warn.conflicts = FALSE) to this library-function call:

usePackage <- function(name) { if (!require(name, character.only = TRUE, quietly = TRUE)) install.packages(name, dep =TRUE) library(name, character.only = TRUE, quietly = TRUE, warn.conflicts = FALSE) }

This will show less warnings when a R projects gets started.