Check if all the .dcm files in the folder belong to the same set.

[sinhaharsh]

As per communication with Chris Rorden,

Segmenting data depends on modality, manufacturer and software version. You can see the heuristic here:
https://github.com/rordenlab/dcm2niix/blob/bb3a6c35d2bbac6ed95acb2cd0df65f35e79b5fb/console/nii_dicom_batch.cpp#L7482

[raamana]

wow - I'd like to learn more about the origins of the issue here as that would imply the library exporting the DICOMs screwed up horribly.

that said, thanks to the nature of the way we populate the MRDataset, we easily accommodate the checks and add the .dcm to the right branch of the project tree, right?

this also means that an MRdataset, when trying to parse a single project or modality, should have the ability to instantiate and add another parallel project should it discover data from another project or modality has been misplaced in this folder. we should also generate some sort of warning, e.g., UnexpectedLocationWarning, if and when we encounter them