WIP: Resolve "private setProblem() ensuring viral call"

Closes #233 (closed)

include/core/capture/capture_base.h

@@ -21,6 +21,7 @@ class CaptureBase : public NodeBase, public std::enable_shared_from_this<Capture
 {
     friend FeatureBase;
     friend FactorBase;
+    friend FrameBase;
 
     private:
         FrameBaseWPtr   frame_ptr_;
@@ -36,6 +37,7 @@ class CaptureBase : public NodeBase, public std::enable_shared_from_this<Capture
     protected:
         unsigned int capture_id_;
         TimeStamp time_stamp_;      ///< Time stamp
+        virtual void setProblem(ProblemPtr _problem) final;
 
     public:
 
@@ -64,7 +66,6 @@ class CaptureBase : public NodeBase, public std::enable_shared_from_this<Capture
         void setFrame(const FrameBasePtr _frm_ptr);
 
     public:
-        virtual void setProblem(ProblemPtr _problem) final;
         const FeatureBasePtrList& getFeatureList() const;
 
         void getFactorList(FactorBasePtrList& _fac_list);