Fixed footnote.
Put 2 tikz graphics in their own files.
Added TexStudio sessions (.txss) to .gitignore.
Began describing SJS, put 2 graphics into their own files.
Added graphic for SJS.
Made three 3-dimensional SJS diagram.
Made diagrams for sympathic and antagonistic judgements.
Added command for painting cubes in Tikz.
Added 3 diagrams to Implementation/SJS section.