Basic support for Frequency as unit

src/App/Application.cpp

@@ -1631,6 +1631,7 @@ void Application::initTypes(void)
     App ::PropertyLength            ::init();
     App ::PropertyArea              ::init();
     App ::PropertyVolume            ::init();
+    App ::PropertyFrequency         ::init();
     App ::PropertySpeed             ::init();
     App ::PropertyAcceleration      ::init();
     App ::PropertyForce             ::init();

src/App/PropertyUnits.cpp

@@ -218,6 +218,18 @@ PropertyDistance::PropertyDistance()
     setUnit(Base::Unit::Length);
 }
 
+//**************************************************************************
+//**************************************************************************
+// PropertyFrequency
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+TYPESYSTEM_SOURCE(App::PropertyFrequency, App::PropertyQuantity)
+
+PropertyFrequency::PropertyFrequency()
+{
+    setUnit(Base::Unit::Frequency);
+}
+
 //**************************************************************************
 //**************************************************************************
 // PropertySpeed

src/App/PropertyUnits.h

@@ -175,6 +175,18 @@ public:
     virtual const char* getEditorName(void) const { return "Gui::PropertyEditor::PropertyAngleItem"; }
 };
 
+/** Frequency property
+ * This is a property for representing frequency. It is basically a float
+ * property. On the Gui it has a quantity like 1/s or Hz.
+ */
+class AppExport PropertyFrequency: public PropertyQuantity
+{
+    TYPESYSTEM_HEADER();
+public:
+    PropertyFrequency(void);
+    virtual ~PropertyFrequency(){}
+};
+
 /** Speed property
  * This is a property for representing speed. It is basically a float
  * property. On the Gui it has a quantity like m/s or km/h.

src/Base/Unit.cpp

@@ -433,6 +433,7 @@ QString Unit::getTypeString(void) const
     if(*this == Unit::Angle                       )       return QString::fromLatin1("Angle");
     if(*this == Unit::Density                     )       return QString::fromLatin1("Density");
     if(*this == Unit::TimeSpan                    )       return QString::fromLatin1("TimeSpan");
+    if(*this == Unit::Frequency                   )       return QString::fromLatin1("Frequency");
     if(*this == Unit::Velocity                    )       return QString::fromLatin1("Velocity");
     if(*this == Unit::Acceleration                )       return QString::fromLatin1("Acceleration");
     if(*this == Unit::Temperature                 )       return QString::fromLatin1("Temperature");
@@ -470,6 +471,7 @@ Unit Unit::AngleOfFriction (0,0,0,0,0,0,0,1);
 Unit Unit::Density(-3,1);
 
 Unit Unit::TimeSpan(0,0,1);
+Unit Unit::Frequency(0,0,-1);
 Unit Unit::Velocity(1,0,-1);
 Unit Unit::Acceleration(1,0,-2);
 Unit Unit::Temperature(0,0,0,0,1);

src/Base/Unit.h

@@ -103,6 +103,7 @@ public:
     static Unit Area;
     static Unit Volume;
     static Unit TimeSpan;
+    static Unit Frequency;
     static Unit Velocity;
     static Unit Acceleration;
     static Unit Temperature;

src/Gui/DlgUnitsCalculatorImp.cpp

@@ -66,8 +66,8 @@ DlgUnitsCalculator::DlgUnitsCalculator( QWidget* parent, Qt::WindowFlags fl )
     actUnit.setInvalid();
 
     units << Base::Unit::Length << Base::Unit::Mass << Base::Unit::Angle << Base::Unit::Density
-          << Base::Unit::Area << Base::Unit::Volume << Base::Unit::TimeSpan << Base::Unit::Velocity
-          << Base::Unit::Acceleration << Base::Unit::Temperature
+          << Base::Unit::Area << Base::Unit::Volume << Base::Unit::TimeSpan << Base::Unit::Frequency
+          << Base::Unit::Velocity << Base::Unit::Acceleration << Base::Unit::Temperature
           << Base::Unit::ElectricCurrent << Base::Unit::ElectricPotential
           << Base::Unit::AmountOfSubstance << Base::Unit::LuminousIntensity << Base::Unit::Stress
           << Base::Unit::Pressure << Base::Unit::Force << Base::Unit::Work << Base::Unit::Power