New class for reading data files
Created by: ssomnath
ioHDF5 simplifies the writing significantly but we don't have a class that simplifies reading. One could envision a class that would take a file handle and create some sort of a tree structure where the only nodes are the groups and the only leaves are the main datasets. all ancillary datasets would have to be accessed as attributes. This class should be able to request an N dimensional form of the dataset and it should be easy to request the spectroscopic vector for plots regardless of the dimension. This class would not read the entire file into memory - rather it would make operations a lot simpler. This class would aid the visualizer (and ORS) significantly.
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