rm many unused fcts, detected with xunused

detected using xunused (described in Developer's corner).

Tests/Functional/Mumufit/PlanCases.cpp

@@ -85,11 +85,3 @@ DecayingSinPlanV2::DecayingSinPlanV2()
     addParameter(Parameter("decay", 0.05, AttLimits::fixed()), 0.05);
     finalizeParameters();
 }
-
-TestMinimizerPlan::TestMinimizerPlan()
-    : ScalarTestPlan("TestMinimizerPlan", TestFunctions::RosenBrock, 0.0)
-{
-    // starting values of fit parameters are already correct
-    addParameter(Parameter("par0", 1.0, AttLimits::limited(-5.0, 5.0), 0.01), 1.0);
-    addParameter(Parameter("par1", 1.0, AttLimits::limited(-5.0, 5.0), 0.01), 1.0);
-}