added default renderer. optimized so that subtrack popups aren't added to the html initially. moved tutorials into specific cells, so we don't need to do it in javascript
added default renderer. optimized so that subtrack popups aren't added to the html initially. moved tutorials into specific cells, so we don't need to do it in javascript

Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode