Changeset 957

adding a file that has the basic panel to fit a beam center to the arc on any of the detector panels. lots of issues to still work out - so don't spend too much time on this since I don't know if this is how the beam center wil actually be determined. but this is at least a proof of principle that it can be done, and be used to test the limitations of this method, i.e. what are the possible pitfalls...