Fixes #2121: CMssqlSchema::resetSequence() incorrectly resets sequence.
Fixes #2217: CHtml::radioButtonList() now supports $empty option.
Merge pull request #2218 from resurtm/fixes-2217

Fixes #2217: CHtml::radioButtonList() now supports $empty option.
Merge pull request #2214 from resurtm/2121-MSSQL-CDbFixtureManager

Fixes #2121: CMssqlSchema::resetSequence() incorrectly resets sequence.