Allow the admin script to create a configuration file.

[lewisgoddard]

Check if the directory is writable when there is no config file, then allow a user to input a MySQL username and password to install the tables and disable future installations on success.

• Make variables in _settings/phoenix.default.php easy to replace.
• Add an installation screen to admin.php
• Check things are working before saving to _settings/phoenix.custom.php

---

Want to back this issue? Post a bounty on it! We accept bounties via Bountysource.

[lewisgoddard]

Sort of blocked by #4