title: package 'Rbbg' is not available (for R version 2.15.2)
body: <p>How do I find out for which versions of R this package <em>is</em> available?</p>
  
  <pre><code>&gt; install.packages("Rbbg", repos = "http://r.findata.org")
  Warning: unable to access index for repository http://r.findata.org/src/contrib
  Warning message:
  package 'Rbbg' is not available (for R version 2.15.2)
  </code></pre>