Renamed distamce to SI conform name length: CDistance->CLength

Started with aviation classes

src/blackmisc/pqlength.h

@@ -0,0 +1,40 @@
+#ifndef PQlength_H
+#define PQlength_H
+#include "blackmisc/pqphysicalquantity.h"
+
+namespace BlackMisc {
+
+/*!
+ * \brief Physical unit length (length)
+ * \author KWB
+ */
+class CLength : public CPhysicalQuantity<CLengthUnit,CLength>
+{
+public:
+    /*!
+     * \brief Default constructor
+     */
+    CLength() : CPhysicalQuantity (0, CLengthUnit::m(), CLengthUnit::m()) {}
+    /**
+     *\brief Copy constructor
+     */
+    CLength(const CLength &length) : CPhysicalQuantity(length) {}
+    /*!
+     * \brief Init by int value
+     * \param value
+     * \param unit
+     */
+    CLength(qint32 value, const CLengthUnit &unit) : CPhysicalQuantity(value, unit, CLengthUnit::m()) {}
+    /*!
+     *\brief Init by double value
+     * \param value
+     * \param unit
+     */
+    CLength(double value, const CLengthUnit &unit) : CPhysicalQuantity(value, unit, CLengthUnit::m()) {}
+    /*!
+     * \brief Virtual destructor
+     */
+    virtual ~CLength() {}
+};
+} // namespace
+#endif // PQlength_H