rethink *SVG.tsv

[mihai-sysbio]

The parser in neo4j-data-generation triggers warnings for missing *SVG.tsv files. A temporary choice was made regarding how to deal with these. We should have a more intentional plan regarding these.

Source comment: #8 (comment)

[mihai-sysbio]

Make sure the placing of the files is documented and that the documentation also resolves these concerns #24 (comment)