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

getfile.cpp

@@ -24,6 +24,7 @@ void getfile(QString fname, int ntrperiod)
     fread(jt9com_.d2,1,44,fp);
     int nrd=fread(jt9com_.d2,2,npts,fp);
     fclose(fp);
+    jt9com_.newdat=1;
   }
 }