Now, the Third Stage of App. Here we use a configuration framework to
provide a web interface to the task of configuration. This is more
complex than the second stages, so much so that it's overkill for a
simple application like this, but in a larger application it's a
relatively small additional complexity for a big usability payoff.

Manifest:

README: 
 This file.

IWantOptions.py: 
 The library used to drive the configuration framework.

CGI.py:
 A base class for the CGIs.

generator.cgi:
 The string generator CGI. Works much like generator.cgi in
 previous stages, but now obtains configuration options via
 I Want Options.

configure.cgi:
 The configuration CGI. Uses I Want Options for the user interface
 and the configuration storage.

definitionStore:
 The definitions of the configuration options.

configurationStore: 
 This file needs to be writable by the webserver. It contains the
 current application settings.