Fix possible crash in various view providers, fix formatting of Coin debug output, fix warning and compiler errors with Coin2 in SoDatumLabel

src/Mod/PartDesign/Gui/ViewProviderChamfer.cpp

@@ -115,7 +115,7 @@ bool ViewProviderChamfer::onDelete(const std::vector<std::string> &)
 {
     // get the support and Sketch
     PartDesign::Chamfer* pcChamfer = static_cast<PartDesign::Chamfer*>(getObject());
-    App::DocumentObject    *pcSupport;
+    App::DocumentObject    *pcSupport = 0;
     if (pcChamfer->Base.getValue()){
         pcSupport = static_cast<Sketcher::SketchObject*>(pcChamfer->Base.getValue());
     }