Add svg graph of inputs...* wqflask/wqflask/markdown_routes.py: New import:
"send_from_directory"
(svg_graph): New function that adds route for svg_graph.
* wqflask/wqflask/static/new/css/markdown.css: New style rules for svg
graph.
* wqflask/wqflask/templates/environment.html: Add new section for
displaying svg graph.