Simplification pass over the installer:

- Flattened the directory structure
- Greatly simplified structure in installer; it now only reports environmental
  checks that fail.  Simplified code that prints exceptions.  Use only mysql
  calls for the installer, but select mysqli automatically if it's available.
  Drop the response file; that's easily replicated with flag support
- Create a random password for the admin user
- Delete unused controllers
- Invert the form of the database config template to be mostly non-PHP
  with just a few PHP calls

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