dxftoelmt: add Print standard error and filepath to the log file

sources/dxf/dxftoelmt.cpp

@@ -22,6 +22,8 @@
 #include <QProcess>
 #include <QMessageBox>
 #include <QDir>
+#include <iostream>
+#include <QDebug>
 
 /**
  * @brief dxftoElmt
@@ -46,6 +48,9 @@ QByteArray dxfToElmt(const QString &file_path)
 	
 	if (process_.waitForFinished())
 	{
+		qInfo()<<"\n Start converting DXF file..........\n"<< file_path;
+		qInfo()<< process_.readAllStandardError(); //Print standard error to log file
+		
 			const auto byte_array{process_.readAll()};
 			process_.close();
 			return byte_array;