title: Add title to meta analysis forest plot
body: <p>I am meta-analysing some studies and drawing a forest plot for my results. However I can`t seem to get the forest plot to display the title.</p>
  
  <p>An example of my code is:</p>
  
  <pre><code>require(meta)
  parameter1&lt;-metaprop(sm="PLOGIT", 
                   event=c(4,16,3,2,10,1,0,2), 
                   n=c(90,402,89,29,153,86,21,48), 
                   level = 0.95, 
                   studlab=c("study 1",
                             "study 2",
                             "study 3",
                             "study 4",
                             "study 5",
                             "study 6",
                             "study 7",
                             "study 8"), 
                   title="meta analysis 1")
  forest(parameter1)
  </code></pre>
  
  <p>When it produces the forest plot, the title "meta analysis 1" is missing.</p>
  
  <p>How can I add this in?</p>
  
  <p>Thanks in advance,</p>
  
  <p>Timothy</p>