Add a new example showing how to fit data from a csv with headers, then plot the data with the fit.
Given the apparent stability of flask_server and the backends, increment the version number to indicate readiness for a general release.

In propagate, rewrite propagate_distances to interleave cpu/gpu code paths and seriously improve the readability of the code.
In xpcs, remove fft keyword as the shift-multiply correlation method has been removed. Rationale: only small datasets benefit from shift-multiply as opposed to the fft calculation method. For such small datasets, the benefit from using shift-multiply is negligible as the calculation time is minimal in either case.
xpcs bug fix