Code cleanup

Interpolator.cpp

@@ -150,14 +150,19 @@ Interpolator::Interpolator()
 }
 
 Interpolator::~Interpolator()
+{
+    clear();
+}
+
+void Interpolator::clear()
 {
     for (auto i = interpolators_.begin(); i != interpolators_.end(); ) {
         delete *i;
         i = interpolators_.erase(i);
     }
-
 }
 
+
 void Interpolator::add (Source *s, const SourceCore &target)
 {
     SourceInterpolator *i = new SourceInterpolator(s, target);

Interpolator.h

@@ -30,6 +30,7 @@ public:
     Interpolator();
     ~Interpolator();
 
+    void clear ();
     void add (Source *s, const SourceCore &target );
 
     void apply (float percent);

Selection.h

@@ -1,6 +1,7 @@
 #ifndef SELECTION_H
 #define SELECTION_H
 
+#include <string>
 #include "SourceList.h"
 
 class Selection