Remove extra tabs from tab-separated export now that Excel has its own

Author: kasemir

app/databrowser/src/main/java/org/csstudio/trends/databrowser3/export/ExportJob.java

@@ -87,7 +87,7 @@ public void run()
         }
     }
 
-    /** @param comment Comment prefix ('#\t' for most ASCII, '%' for Matlab, ...)
+    /** @param comment Comment prefix ('# ' for most ASCII, '% ' for Matlab, ...)
      *  @param model Model with data
      *  @param start Start time
      *  @param end End time

app/databrowser/src/main/java/org/csstudio/trends/databrowser3/export/PlainExportJob.java

@@ -45,10 +45,8 @@ public PlainExportJob(final Model model,
             final String filename,
             final Consumer<Exception> error_handler,
             final boolean unixTimeStamp)
-    {   // MS Excel fails to recognize tab-separated data columns
-    	// unless the initial header rows also contain at least one tab per row,
-    	// so add that to comment
-        super("#\t", model, start, end, source, optimize_parameter, filename, error_handler, unixTimeStamp);
+    {
+        super("# ", model, start, end, source, optimize_parameter, filename, error_handler, unixTimeStamp);
         this.formatter = formatter;
     }