BUG: change return type to double in GetSecond, as it can return a fraction of second

Modules/Core/Metadata/include/otbMetaDataKey.h

@@ -281,7 +281,7 @@ struct OTBMetadata_EXPORT Time : tm
   int GetYear() const;
   int GetHour() const;
   int GetMinute() const;
-  int GetSecond() const;
+  double GetSecond() const;
   ///@}
 };
 

Modules/Core/Metadata/src/otbMetaDataKey.cxx

@@ -222,7 +222,7 @@ int Time::GetMinute() const
   return tm_min;
 }
 
-int Time::GetSecond() const
+double Time::GetSecond() const
 {
   return tm_sec + frac_sec;
 }