Pt fit example now loading data the ba way

Base/Axis/Frame.cpp

@@ -165,3 +165,9 @@ Frame* Frame::flat() const
             outaxes.emplace_back(s->clone());
     return new Frame(std::move(outaxes));
 }
+
+void Frame::setScale(size_t k_axis, Scale* scale)
+{
+    m_axes.replace_at(k_axis, scale);
+    m_size = FrameUtil::product_size(m_axes.reference());
+}