qa_debug function for quick and dirty variable output
Add autoloader

Loosely follows PSR-0.
Requires classes of the form Q2A_<Namespace>_<Class>, e.g. Q2A_Util_String
Maps to file qa-include/Q2A/<Namespace>/<Class>.php, e.g. qa-include/Q2A/Util/String.php
Add new autoloaded classes Q2A_Util_Usage and Q2A_Util_String

Debugging functions converted to use Usage.
String class not yet in use.
Point old qa_usage_* functions to new class
Add query logging function to Usage, refactor qa-db.php
DocBlock comments in qa-db.php
Refactor qa-index.php (mainly coding style)