Added the relaxation dispersion dataset recorded at 800 MHz in the system-test.
This was kindly provided by Dr Flemming Hansen (flemming AT pound DOT med DOT utoronto DOT ca) and
was previously published in: Hansen, Vallurupalli & Kay, 2008, JPhysChemB, 112: 5898-5904.
The original format was different and two formats were made ('generic' and 'sparky'), as for the
dataset recorded at 500 MHz.