libpsdxx [WP]: fix IntervalSeries container

pass interval value correctly to base class
derived class does not require its own field interval

src/libs/libpsdxx/psd.h

@@ -104,14 +104,15 @@ namespace psd {
     public:
       //! series
       Tseries& data;
-      //! sampling interval (seconds for time series, Hz for spectral data)
-      double interval;
 
       //! default constructor
-      IntervalSeries(): data(Tbase::Mdata), interval(0) { }
+      IntervalSeries(): data(Tbase::Mdata) { }
       //! copy constructor
       IntervalSeries(const IntervalSeries& s):
-        data(Tbase::Mdata), interval(s.interval) { Tbase::Mdata=s.Mdata; }
+        data(Tbase::Mdata) {
+          Tbase::Mdata=s.Mdata; 
+          Tbase::interval=s.interval; 
+        }
 
       //! copy operator
       IntervalSeries& operator=(const IntervalSeries& s)
@@ -164,8 +165,8 @@ namespace psd {
       void set_divisor(const unsigned int& n);
       void set_padfactor(const unsigned int& n);
       void set_overlap(const double& f);
-      void set_verbose(const bool& f);
-      void set_debug(const bool& f);
+      void set_verbose(const bool& f=true);
+      void set_debug(const bool& f=true);
 
       unsigned int nsegments() const { return(Mnsegments); }
       unsigned int divisor() const { return(Mdivisor); }