PROG: modified displayTextFile method to query for systems fixed width font

#include <QDebug>

#include <QFile>

#include <QFontDatabase>

#include <QHeaderView>

#include <QSizePolicy>

#include <QStandardItem>

    QTextStream in(&file);

    QTextEdit *qText=new QTextEdit();

    qText->setFontFamily("Courier");

    // From QFontDatabase::systemFont(SystemFont type) method description: returns most adequate

    //      font for a given typecase (here FixedFont) for proper integration with system's look and

    //      feel.

    const QFont fixedFont = QFontDatabase::systemFont(QFontDatabase::FixedFont);

    qText->setFontFamily(fixedFont.family());

    while (!in.atEnd()) {

      qText->append(in.readLine());