Output format

[mb010]

Should the output look like this instead of always returning a tuple (including a tuple of 1 when just images are returned):

    def __get_item__(self, index, ...):
        ...
        if not self.targets and not return_wcs:
            return img
        else:                
            output = [img]
            if self.targets:
                output += [targets]
            if return_wcs:
                output += [wcs_]
            return output