NEW: Adding unit test for performReadonlyTransformation #nd fixing OptionSetField #2503
BUG: Fixing undefined variables and function parameters for PerformReadonlyTransformation unit tests
NEW: Adding unit test to OptionsetField for read only fields
ENHANCEMENT Added CheckboxSetField->setDefaultItems() to tick specified checkboxes regardless of the value passed
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/trunk@99596 467b73ca-7a2a-4603-9d3b-597d59a354a9