clarify debug help, add ability to draw solid boxes, use non-utf8 chars because they appear to be broken
clarify debug help, add ability to draw solid boxes, use non-utf8 chars because they appear to be broken

breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval,breunigs/gnt-eval