Moved PQs from blackcore to blackmisc, added header for namespace, mainpage.dox for Doxygen

src/blackmisc/pqpressure.cpp

@@ -0,0 +1,38 @@
+#include "blackmisc/pqpressure.h"
+
+namespace BlackMisc {
+
+/**
+ * Default constructor
+ */
+CPressure::CPressure() : CPhysicalQuantity(0, CPressureUnit::Pa(), CPressureUnit::Pa())
+{
+    // void
+}
+
+/**
+ * Constructor
+ */
+CPressure::CPressure(const CPhysicalQuantity &pressure): CPhysicalQuantity(pressure)
+{
+    //void
+}
+
+/**
+ * Constructor
+ */
+CPressure::CPressure(qint32 value, const CPressureUnit &unit) : CPhysicalQuantity(value, unit, CPressureUnit::Pa())
+{
+    // void
+}
+
+/**
+ * Constructor
+ */
+CPressure::CPressure(double value, const CPressureUnit &unit) : CPhysicalQuantity(value, unit, CPressureUnit::Pa())
+{
+    // void
+}
+
+
+} // namespace