CUBRID Database 9.0 Support.
Ref: converted spaces to tabs according to Yii coding conventions.
Ref: converted spaces to tabs.
Merge branch 'cubrid-database-support' of https://github.com/kadishmal/yii into kadishmal-cubrid-database-support

* 'cubrid-database-support' of https://github.com/kadishmal/yii:
  Ref: converted spaces to tabs.
  Ref: converted spaces to tabs according to Yii coding conventions.
  CUBRID Database 9.0 Support.
CUBRID copyright, version and indentation fixes

adjustments to PR #1893
Code style

adjustments to PR #1893
Allow sql files diff & preview in gii
Backport Request::getPreferredLanguage() from yii2
Parameter 'id' added for 'ajaxUpdateError' invoke at 'jquery.yiigridview' and 'jquery.yiilistview'
Doc comments for 'ajaxUpdateError' at 'CGridView' and 'CListView' have been updated.
Issue #2850 added to CHANGELOG
Added tests of the CUploadedFile getExtensionName method
Reusing the CFileHelper getExtension method
Shifted CUploadedFile getExtensionName to use CFileHelper getExtension
Enh #3225: Add CForm::errorSummaryHeader and CForm::errorSummaryFooter, used like in CActiveForm::errorSummary().
Relocated the line added to CHANGELOG.
jquery.yiiGridView fixed to be able handling special chars if history is enabled
jquery.yiiListView fixed to be able handling special chars if history is enabled
Issue #3253 added to CHANGELOG
Issue #3253 corrected to #2519 at CHANGELOG