title: Good, simple configuration library for large c++ project?
body: <p>We are developing a rather large project in C++, where many components require configuration parameters. We would like to use a central place to configure everything (like a registry), preferably with a nice and simple GUI (e.g. like Firefox's <code>about:config</code>) and a simple API. </p>
  
  <p>I am pretty sure this that many applications have this kind of problem, but could not find any libraries available that can be readily used for this. Does anyone know of a good (preferably free) library to use for this?</p>
  
  <p>This should work cross platform in Windows and Linux.</p>