title: How to build all subdirectories?
body: <p>I want <code>cargo build</code> to build every package in a subdirectory of the current directory and likewise with <code>cargo check</code>.</p>
  <p>What should be in <code>Cargo.toml</code> in the current directory?</p>
  <p>(The current directory itself does not contain any software, only its subdirectories with interdependent applications and libraries.)</p>