Fix file permissions.
Fix BYE detection.
Rely on PHPUnit's autoloading.
Clear scripts on-demand.

Otherwise separate tests for connecting and authentication are useless.
Use different script name for test configuration.

Makes it more difficult to commit real credentials accidentally too.
Make sure that none of the to-be-removed scripts are active.
Fix getting script diffs, now that we don't clean up everything.
Don't call PEAR:: methods statically to avoid notices.