ENH: Fixed issues related to Qt5

1. There seems ot be a bug w/r to QT5's signal and slots concerning when passing a reference to const JSON data -  pqPresetDialog's apply preset signal should pass JSON data when a preset is selected.  If the signal is connected to a slot that takes in no argumenets the signal is properly connected.  However, if you connect the signal to a slot that taked in the reference to the JSON object, the connect method says there is no such slot.

Workaround - changed the slot signature to take in no arguements.

2. In Qt5 , Frames no longer have a setShown method but instead now use setVisible.

smtk/extension/paraview/operators/smtkAssignColorsView.cxx

@@ -298,7 +298,7 @@ void smtkAssignColorsView::createWidget()
     SLOT(show()));
   QObject::connect( // When the user has chosen a preference, remember and apply it.
     this->Internals->PaletteChooser, SIGNAL(applyPreset(const Json::Value&)), this,
-    SLOT(setDefaultPaletteAndApply(const Json::Value&)));
+    SLOT(setDefaultPaletteAndApply()));
 
   // Signals and slots related to single-color mode:
   QObject::connect( // When asked, apply the colormap specified by the user preference.
@@ -433,10 +433,11 @@ void smtkAssignColorsView::applyDefaultColor()
   this->requestOperation(op);
 }
 
-void smtkAssignColorsView::setDefaultPaletteAndApply(const Json::Value& preset)
+void smtkAssignColorsView::setDefaultPaletteAndApply()
 {
+  const Json::Value& preset = this->Internals->PaletteChooser->currentPreset();
   std::string name(preset["Name"].asString().c_str());
-  //std::cout << "Change default palette to \"" << name << "\"\n";
+  //std::cerr << "Change default palette to \"" << name << "\"" << std::endl;
   pqSettings* settings = pqApplicationCore::instance()->settings();
   settings->setValue("ModelBuilder/Operators/AssignColors/defaultPalette", name.c_str());
   this->Internals->PaletteChooser->hide();

smtk/extension/paraview/operators/smtkAssignColorsView.h

@@ -54,9 +54,9 @@ protected slots:
 
   virtual void chooseDefaultColorAndApply();
   virtual void applyDefaultColor();
-  virtual void setDefaultPaletteAndApply(const Json::Value& preset);
   virtual void applyDefaultPalette();
   virtual void removeColors();
+  virtual void setDefaultPaletteAndApply();
 
   // This slot is used to indicate that the underlying attribute
   // for the operation should be checked for validity

smtk/extension/qt/qtCollapsibleGroupWidgetInternals.ui

@@ -50,7 +50,7 @@
    <sender>VisibilityControl</sender>
    <signal>toggled(bool)</signal>
    <receiver>BodyFrame</receiver>
-   <slot>setShown(bool)</slot>
+   <slot>setVisible(bool)</slot>
    <hints>
     <hint type="sourcelabel">
      <x>56</x>