ConstKBinAxis: rm unused c'tor; protected -> private

Base/Axis/ConstKBinAxis.cpp

@@ -18,13 +18,6 @@
 #include <cmath>
 #include <iomanip>
 
-ConstKBinAxis::ConstKBinAxis(const std::string& name, size_t nbins)
-    : VariableBinAxis(name, nbins)
-    , m_start(0)
-    , m_end(0)
-{
-}
-
 ConstKBinAxis::ConstKBinAxis(const std::string& name, size_t nbins, double start, double end)
     : VariableBinAxis(name, nbins)
     , m_start(start)

Base/Axis/ConstKBinAxis.h

@@ -34,9 +34,7 @@ public:
 
     void clip(double lower, double upper) override;
 
-protected:
-    ConstKBinAxis(const std::string& name, size_t nbins);
-
+private:
     void print(std::ostream& ostr) const override;
     bool equals(const IAxis& other) const override;