slimParticle rename addMortality => setMortality

modules/slimParticles/dgParticleTracker2D.h

@@ -368,7 +368,7 @@ public:
    *        1 : constant mortality rate given by [1] mortRateMax (by day)
    *        2 : weibullMortalityRate with [2] lambda  and [3] nu;
    */
-  void addMortality(int type, double rateMax, double weibullLambda = 0, double weibullNu = 0) {
+  void setMortality(int type, double rateMax, double weibullLambda = 0, double weibullNu = 0) {
     _mortFlag = true;
     _mortType = type;
     if (type != 1) {