title: Formatting latex (to_latex) output
body: <p>I've read <a href="https://stackoverflow.com/questions/14380371/export-a-latex-table-from-pandas-dataframe/14383654#14383654">about the <code>to_latex</code></a> method, but it's not clear <strong>how to use the formatters argument</strong>.</p>
  
  <p>I have some numbers which are <strong>too long</strong> and some which I want <strong>thousand separators</strong>.</p>
  
  <p><em>A side <a href="https://github.com/pydata/pandas/issues/2924" rel="noreferrer">issue</a> for the <code>to_latex</code> method on multi-indexed tables, the indices are parsed together and it issues some <code>&amp;</code>s in the latex output.</em></p>