Load (if a string) or just return voxel selection
s: basestring or volume_mask_dict.VolumeMaskDictionary :
if a string it is assumed to be a file name and loaded using h5load. If a volume_mask_dict.VolumeMaskDictionary then it is returned.
r: volume_mask_dict.VolumeMaskDictionary :
mvpa2.misc.surfing.volume_mask_dict.deprecated
mvpa2.misc.surfing.volume_mask_dict.h5load
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