xnat search query changes

[dadrobny]

To discuss:

1. Should the search query be adapted to skip different volume reconstructions of the DICOM data displaying the same scan? E.g. different voxel sizes, different FOV and orientation.
2. How to then make sure to keep the largest FOV if multiple are provided?
3. Filter out 2D images? Maybe this could also be a checkbox option in the GUI.
4. Filter out images with errors in the volume reconstruction