This pull request adds the ability to use query parameters to pass filters into the StudyList from
the url. These parameters are of the same form used by the QIDO requests to apply the filters. This
solution seemed to me to be the most obvious way to manage them. There's one open question however,
around what to do with the parameters after the initial load. For now, the URL parameters are
overridden the moment the user tries to add another filter. Depending on review feedback it seems
like it may make more sense for those query parameter filters to be "permanent" and so any further
filtering would augment those parameters rather than replace them.
Erik Ziegler