This reverts commit bb6e2d93.

The configuration window now has a search bar which reacts to user
input on the fly.

Reconstruction now supports multiple groups until rendering. This means
that the scene_A and scene_B variables are now vectors. To support this
change, a bug was fixed in configuration.cpp. Previously, instead of
adding multiple paths, the configure() method simply added the same path
multiple times. Now all paths are correctly added to the configuration.