use 2.8.0 (no GSL stuff) for IMD Xsec in evolver
attempt to include only new single kaon stuff in Messenger config xml in evolver
remove AlvarezRusoCohPi from Messenger_laconic config xml
remove GSL stuff from NuElectronXSec config xml
remove AlvarezRusoCohPi from Messenger_rambling config xml
remove GSL stuff from integrators for non-single kaon modes
don't keep the lamp-generated configure script in the repo
remove AlvarezRuso COH Pi stuff from UserPhysicsOptions