Multiple changes:  Fixed accidental inversion of Y direction on normalmaps for most glass-block-based objects, default ladder, windowed pipes, poisonivy.  Better normalmaps for bobblocks blocks.  Fixed incorrect visual division between tiles in default steel door, default wood door, and homedecor closet and glass/wood door normalmaps (all colors), and generally improved their quality.  Better quality for mesecons 'on' lightstones and their normalmaps.  Fixed incorrect offsets on other NC normalmaps and improved overall quality.  Fixed inverted Y in, and slightly improved grass, grass-side and dirt normalmaps.