Overhauled initcode.php

Bundled debug functions into a combined _DEBUG class, with additional
functionality. Renamed and reconfigured _ENVIRONMENT methods,
strengthening parameter validation. Wrote PHPDoc documentation for all
public methods in the file.

Changes to the storage format of the base path required changes to
every place it was used in my code, including several shared/utility
classes and the output templates.

One line of code beyond initcode.php needed to be changed to reflect
the replacement of debug functions with equivalent class methods, and
advances in my Doonesbury project required additions to the accented
character roster in my user input string validator.