Fix:JuxtaLearn

Accessibility and usability enhancements for the JuxtaLearn Tricky Topic tool, Diagnostic Quiz and ClipIt. This includes SVG map bits, Sankey diagram, and so on.

Note, the SVG here is a lot more amenable to fixes than the HTML5 canvas + SVG on PhET simulations.

Developer: Martin Hawksey linkedin.com:in/mhawksey, twitter.com:mhawksey and Nick Freear.

These fixes were "forked" from: Fix:OER Evidence Hub.

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