Fixing issue with problems of error on callback. If the callback for project_new is not executed, the one on edit fails. Therefore I just made sure that it is retried before. Additionally fixed an error on the project_new callback
added parameter script_dir to configuration section, defaults now to /xowiki; can be reset to the old behaviour via e.g.: xinha_config.script_dir = '.';
added parameter script_dir to configuration section, defaults now to /xowiki; can be reset to the old behaviour via e.g.: xinha_config.script_dir = '.';