PDF Info set to default, transparent PNGs do not work

[Gramps]

It seems the PDF has a default title and creator set which may be a mistake in the code on line 145:

content += _addInfo("Test", "Nolan")

I fixed it by just removing these two strings. Passing anything to _addInfo seems kind of useless since we pass these during the initial PDF creation at PDF.newPDF(), PDF.setTitle(), and PDF.setCreator() so this should just pull from the main variables these set:

func _addInfo():
        var ret = str(len(_xref)) + " 0 obj\n<<\n"
	if not _title.is_empty():
		ret += "/Title (" + _title + ")\n"
	if not _creator.is_empty():
		ret += "/Creator (" + _creator + ")\n"
	ret += ">>\nendobj\n"
	return ret

Also, no matter what I do, I cannot get PNGs to have transparency which makes layering images over each other a mess. I'm not sure if this is just not possible or if there may be another bug somewhere.