- Change inst/app/www/favicon.ico
- Create a hex logo
- Rename global variables in inst/global.R: sdd_xxx as course_xxx + sdd_url -> course_url with mongodb://127.0.0.1/course instead of mongodb://127.0.0.1/sdd
- In inst/global.R, make a more robust connection to MongoDB database and report erros clearly
- Rename mod_sdd_tables to mod_course_tables
- In internal function, decouple from SDD and allow a different course context.