moved the y-axis flip to the get_data method on the Sn vis format to consolidate the operation. added axial lineout functionality
added "noflip" functionality, to control if a dataset needs to be flipped in the y-axis to look right. It looks for an integer attribute on the HDF5 file object called 'noflip.' if it is set to 1 the datasets will not be flipped
rearranged some of the datafile reading modules