example 1-D scan data from NeXus h5py example
example 1-D scan text files, refs #10
example SPEC data file from APS USAXS
require this method to be defined in each subclass
require pyspec package, ignore unused imports, correct "except" clause syntax errors
ignore unused imports, add TODO to consider prompting user with dialog how to interpret the text file (allow for more than just 2 or 3 column text, for example, also let user define dataset names, ...)