Miscellany

* Use heredoc instead of concatenated quotes for multiline SQL statements
+ Add requirements to README file
- Remove debugging `echo()`
* Pass failure reason through to uploader when trying to add things to the db
* Remove "install tables" checkbox
* Change install wizard so that one can't overwrite a configuration
* Change install wizard flow so you run it twice, once for config and once for
  tables

2 hours intermittent work