quasielastic diffusion-in-a-sphere fitting algorithm

[jmborr]

Fitting function modelling the continuos diffusion of a particle confined to an spherical volume. More details in the corresponding WIKI page [http://www.mantidproject.org/DiffSphere].

TESTING: Upload all attachments to your /tmp directory, and run the python script in the Script Window of MantidPlot. Look in data_Parameters workspace to check that the fitting parameters are close to the target values, namely:
Intensity = 0.74, Radius = 2.25, Diffusion = 0.024

[jmborr]

This issue was originally trac ticket 4394

[jmborr]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/4394/test.py
(uploaded by @jmborr on 2013-12-23T21:03:55)

---

http://trac.mantidproject.org/mantid/raw-attachment/ticket/4394/data.nxs
(uploaded by @jmborr on 2013-12-23T21:04:06)

---

http://trac.mantidproject.org/mantid/raw-attachment/ticket/4394/resolution.nxs
(uploaded by @jmborr on 2013-12-23T21:04:18)

---