title: Fitnesse: Open file relative to current page
body: <p>Is there a simple way to open a file from within a fixture, using a path relative to the current wiki page? The files are actually being stored in the same directory as the wiki page.<p>
  I'm using those files to store some expected data, that is later compared to the data actually measured while executing a test. Embedding the data in the wiki page would simply be too much. <p>
  I've already spent quite some time searching through the API, but couldn't find anything except how to access files in Fitness' root folder.</p>