Support color profile customization for graph

[b]

I like the default black background but we should at a minimum support an alternate view with a white background for the people who inevitably want to print a screenshot (or an export??) of the graph they are building. Hopefully cytoscape.js will make this easy.

[Richard Bruskiewich]

A checkbox was added to the concept map tool bar that allows toggling between white and black background. The colors on the white background seem a bit washed out, so perhaps a second iteration on this feature can implement a stronger contrast of colors using a more sophisticated toggling of CSS.

[Richard Bruskiewich]

This issue could be elaborated further, but basic functionality is in place.

[b]

Concur with earlier comment. A quick CSS font color adjustment when out of black-background mode would really help the white background view.

[Richard Bruskiewich]

We need a better understanding of cytoscape.js management of node and edge styles, and a means of dynamically modifying the same, as user preferences.

[Richard Bruskiewich]

Fully re-opened to target cytoscape.js style changes of nodes (for white background)

[Richard Bruskiewich]

Might still wish to move concept map coloration into a formal 'user preference' dialog box