Fix Qwt deprecated declarations (#356)

Author: efernandez

fuse_loss/include/fuse_loss/qwt_loss_plot.h

@@ -218,7 +218,7 @@ class QwtLossPlot
 {
 public:
   QwtLossPlot(const std::vector<double>& residuals, const HSVColormap& colormap)
-    : residuals_(QVector<double>::fromStdVector(residuals))
+    : residuals_(residuals.cbegin(), residuals.cend())
     , loss_evaluator_(residuals)
     , colormap_(colormap)
     , magnifier_(plot_.canvas())
@@ -251,7 +251,7 @@ class QwtLossPlot
   {
     QwtPlotCurve* curve = new QwtPlotCurve(name.c_str());
 
-    curve->setSamples(residuals_, QVector<double>::fromStdVector(values));
+    curve->setSamples(residuals_, QVector<double>(values.cbegin(), values.cend()));
 
     curve->setPen(colormap_[curves_.size()]);
     curve->attach(&plot_);