version 1.2.1:

  - Add constants YOD_VIEWEXT, YOD_LOGPATH
  - Change the auto running mechanism
  - Change the autoload mechanism
  - Add the error handling
  - Add a protected method dbmodel in the class Yod_Controller and Yod_Model
  - Add the class Yod_DbPdo to the Yod extension
version 1.2.1:

  - Add constants YOD_VIEWEXT, YOD_LOGPATH
  - Change the auto running mechanism
  - Change the autoload mechanism
  - Add the error handling
  - Add a protected method dbmodel in the class Yod_Controller and Yod_Model
  - Add the class Yod_DbPdo to the Yod extension