Updates to Users Guide.

Double-click on waterfall sets Tol to a reduced (mode-dependent) value.
Tol is saved/restored on program restart.
Added digital gain slider for setting input level.
Garbage decode "15P6715P67WCV" is rejected.
Arrays ss and c0 are copied and saved when newdat=1.  Further processing is
done on the copies.


git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@2712 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

plotter.h

@@ -35,7 +35,6 @@ public:
   qint32  m_nSpan;
   qint32  m_binsPerPixel;
   qint32  m_fQSO;
-  qint32  m_tol;
   qint32  m_fCal;
   qint32  m_w;
 
@@ -52,6 +51,7 @@ public:
   void UpdateOverlay();
   void setDataFromDisk(bool b);
   void setTol(int n);
+  int  Tol();
   void setBinsPerPixel(int n);
   int  binsPerPixel();
   void setFQSO(int n, bool bf);
@@ -114,6 +114,7 @@ private:
   qint32  m_h;
   qint32  m_h1;
   qint32  m_h2;
+  qint32  m_tol;
 
 private slots:
   void mousePressEvent(QMouseEvent *event);