Reinforced Glass Stacking

The issue here https://github.com/d3athrow/vgstation13/issues/279 has been fixed at https://github.com/d3athrow/vgstation13/issues/326, although the commit at https://github.com/d3athrow/vgstation13/issues/279 opens a new issue https://github.com/d3athrow/vgstation13/issues/390.