Comment 2 for bug 323452

I changed the rendering code to use FTFont::LineHeight as a scale factor (instead of FONT_ZIZE_FACTOR), so this overlapping shouldn't happen anymore.
On dlh's request I added a new setting, LINE_HEIGHT, that lets you customize the font size (though if you enlarge it you might get overlapping again, of course).
I also removed some autogenerated characters off the default font that had huge descenders, so it should not render too small even if you don't screw around with LINE_HEIGHT.