timeseries [WP]: avoid copy constructor with base class argument

Taking a reference to a public base class object in a copy constructor allows
implicit type conversion even if the constructor is declared explicit. This
causes undesired type conversion in instatiation of timeseries containers. In
such cases the header data commonly is lost silently. I get rid of all such
constructors, forcing users to explicitly express the desire of type
conversion.

src/libs/libtsioxx/sfftimeseries.h

@@ -130,9 +130,13 @@ namespace ts {
            */
           //@{
           //! default constructor
-          SFFTimeSeries(): Tbase(), Mtraceindex(-1) { }
-          explicit SFFTimeSeries(const Tseries& s): 
-            Tbase(s), Mtraceindex(-1) { }
+          SFFTimeSeries(const int& i=-1): Tbase(), Mtraceindex(-1) { }
+          SFFTimeSeries(const Tseries& s, const Theader& h, const int& i=-1): 
+            Tbase(s, h), Mtraceindex(i) { }
+          SFFTimeSeries(const Tbase& s, const int& i=-1): 
+            Tbase(s), Mtraceindex(i) { }
+          SFFTimeSeries(const SFFTimeSeries& s): 
+            Tbase(s), Mtraceindex(s.Mtraceindex) { }
           //@}
             
           /*! \name Type conversion and assignment operators.

src/libs/libtsxx/tsxx.h

@@ -105,10 +105,10 @@ namespace ts {
          */
         //@{
         TimeSeries() { }
-        explicit TimeSeries(const Tseries& s): Tseries(s) { }
-        explicit TimeSeries(const Theader& h): header(h) { }
         TimeSeries(const Tseries& s, const Theader& h):
           Tseries(s), header(h) { }
+        TimeSeries(const Ttimeseries& s):
+          Tseries(s), header(s.header) { }
         //@}
 
         /*! \name Assignment operators.