saveModelToText method
Saves the model to the text and returns the model text.
Implementation
String saveModelToText() {
final res = StringBuffer();
res.write(saveSectionToText('r'));
res.write('\n\n');
res.write(saveSectionToText('p'));
res.write('\n\n');
var g = saveSectionToText('g');
g = g.replaceAll('.', '_');
res.write(g);
if (g.isNotEmpty) {
res.write('\n\n');
}
res.write(saveSectionToText('e'));
res.write('\n\n');
res.write(saveSectionToText('m'));
return res.toString();
}