This replaces {data_dir}/settings throughout the code, so that
the configuration may be placed somewhere else in the directory
structure (e.g. in /etc).
With the website directory now tied to the project directory instead
of the build directory, it is no longer possible to use make for
running the web server.
Given that the module is now copied to the project directory
when no module path is set, we need the information that the
module path is empty. Therefore hand in the default module path
in a separate variable.
This is a exception to be thrown when the error occures because
of bad user data. We don't want to print a full stack trace in
these cases but just tell the user what went wrong.
The new functions always creates normal and partitioned functions.
Also adds specialised connection and cursor classes for adding
frequently used helper functions.
