major code cleanup and update, see release notes


git-svn-id: svn+ssh://svn.cern.ch/reps/lhcb/Urania/trunk/PhysFit/B2DXFitters@171989 4525493e-7705-40b1-a816-d608a930855b
Minor fix after major change


git-svn-id: svn+ssh://svn.cern.ch/reps/lhcb/Urania/trunk/PhysFit/B2DXFitters@171991 4525493e-7705-40b1-a816-d608a930855b
Minor fix: k-factor plotting script


git-svn-id: svn+ssh://svn.cern.ch/reps/lhcb/Urania/trunk/PhysFit/B2DXFitters@171992 4525493e-7705-40b1-a816-d608a930855b