Resolve "Work on const / non-const in wolf base classes"

Closes #184 (closed)

include/core/problem/problem.h

@@ -234,7 +234,7 @@ class Problem : public std::enable_shared_from_this<Problem>
          *   - This decision is made at problem level, not at processor configuration level.
          *   - Therefore, if you want to permanently configure a processor for not creating key frames, see Processor::voting_active_ and its accessors.
          */
-        bool permitKeyFrame(ProcessorBasePtr _processor_ptr);
+        bool permitKeyFrame(ProcessorBasePtr _processor_ptr) const;
 
         /** \brief New key frame callback
          *
@@ -250,7 +250,7 @@ class Problem : public std::enable_shared_from_this<Problem>
          *   - This decision is made at problem level, not at processor configuration level.
          *   - Therefore, if you want to permanently configure a processor for not creating estimated frames, see Processor::voting_active_ and its accessors.
          */
-        bool permitAuxFrame(ProcessorBasePtr _processor_ptr);
+        bool permitAuxFrame(ProcessorBasePtr _processor_ptr) const;
 
         /** \brief New auxiliary frame callback
          *