Changes Related with Model Scenarios Yii Framework

  Removed CModel::safeAttributes(). Safe attributes are now de ned to be those that
are being validated by some rules as de ned in CModel::rules() for the particular
scenario.
Changed CModel::validate(), CModel::beforeValidate() and CModel::afterValidate().
CModel::setAttributes(), CModel::getSafeAttributeNames() The 'scenario' parame-
ter is removed. You should get and set the model scenario via CModel::scenario.
Changed CModel::getValidators() and removed CModel::getValidatorsForAttribute().
CModel::getValidators() now only returns validators applicable to the scenario as
speci ed by the model's scenario property.
Changed CModel::isAttributeRequired() and CModel::getValidatorsForAttribute().
The scenario parameter is removed. The model's scenario property will be used,
instead.
Removed CHtml::scenario. CHtml will use the model's scenario property instead.