small changes to Suvayu's new k-factor template code: fix 'else if' -> 'elif', use standard shell/python trampoline code to get the environment right


git-svn-id: svn+ssh://svn.cern.ch/reps/lhcb/Urania/trunk/PhysFit/B2DXFitters@166737 4525493e-7705-40b1-a816-d608a930855b