title: Install an R package temporarily, only for the current session
body: <p>Sometimes on Stack Overflow, there's a question relative to a package which is not installed on my system, and which I don't plan to reuse later.</p>
  
  <p>If I install the package with <code>install.packages()</code>, it will be put in one of my R install libraries, and then will take some storage space and be updated each time I run <code>update.packages()</code>.</p>
  
  <p>Is there a way to install a package only for the current R session ?</p>