refs #449 Remove internal usage of QTime in CTime

QTime does not support values greater than 24 hours. Therefore
parsing from such values or conversions failed. This commit
reimplements all necessary methods without using QTime.

src/blackmisc/pq/time.h

@@ -55,10 +55,6 @@ namespace BlackMisc
             //! From string hh:mm, or hh:mm:ss, or time units such as s, min
             void parseFromString(const QString &time, BlackMisc::PhysicalQuantities::CPqString::SeparatorMode mode);
 
-            //! To Qt time
-            //! \warning sign not considered
-            QTime toQTime() const;
-
             //! Parts hh, mm, ss
             //! \warning sign not considered
             QList<int> getHrsMinSecParts() const;