add functionality to remove an added marker

src/amdis/ProblemStat.hpp

@@ -361,7 +361,8 @@ namespace AMDiS
       linearSolver_ = solver;
     }
 
-    /// Wrap the solver into a non-destroying shared_ptr, or move it into a new shared_ptr
+    /// Wrap the solver reference into a non-destroying shared_ptr, or move it
+    /// into a new shared_ptr if it is a temporary.
     template <class S,
       REQUIRES(std::is_base_of<LinearSolverType, remove_cvref_t<S>>::value)>
     void setSolver(S&& solver)
@@ -399,8 +400,8 @@ namespace AMDiS
         it.first->second->setMaximumMarking(true);
     }
 
-    /// Wrap the reference into a non-destroying shared_ptr or move it into a new shared_ptr and
-    /// store it in the problemand store in the problem
+    /// Wrap the reference into a non-destroying shared_ptr or move it into a
+    /// new shared_ptr if it is a temporary.
     template <class M,
       REQUIRES(std::is_base_of<Marker<Grid>, remove_cvref_t<M>>::value)>
     void addMarker(M&& marker)