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
Update database.arr.txt
CFileValidator is no longer unsafe by default

CFileValidator is no longer unsafe by default to prevent setting
arbitrary values. Instead, when no file is uploaded attribute is set to
null (marcovtwout)
Merge pull request #3197 from marcovtwout/1257-fix-CFileValidator-safe-mass-assignment

1257 fix c file validator safe mass assignment
Adding support for the X-HTTP-Method-Override header.
Adding changelog info about support for the X-HTTP-Method-Override header.
Update CHANGELOG
Update CHANGELOG
Update CHANGELOG
Merge pull request #3202 from infoza/master

Adding support for the X-HTTP-Method-Override header.
one more revert.
Revert "one more revert."

This reverts commit 91787e87872a114da3694067e5618b0c70446687.
#3077