Remove unused function

imageinfo.cpp

@@ -51,14 +51,6 @@ FITSRecord::FITSRecord(const LibXISF::Property &property)
     xisf = true;
 }
 
-QByteArray FITSRecord::valueToByteArray() const
-{
-    if(value.type() == QVariant::Bool)
-        return value.toBool() ? "T" : "F";
-    else
-        return value.toString().toLatin1();
-}
-
 ImageInfo::ImageInfo(QWidget *parent) : QTreeWidget(parent)
 {
     setColumnCount(3);

imageinfo.h

@@ -19,7 +19,6 @@ struct FITSRecord
     FITSRecord(const QByteArray &key, const QVariant &value, const QByteArray &comment);
     FITSRecord(const LibXISF::FITSKeyword &record);
     FITSRecord(const LibXISF::Property &property);
-    QByteArray valueToByteArray() const;
 };
 
 class SkyPoint