TUP-1616 Refactoring after
http://talendforge.org/trac/top/changeset/112329
-->remove the field: confirmForDQ, change the method deleteElements from
private to protected ( for the child to override it)
TUP-1616 change deleteElements method from private to protected
Merge pull request #20 from yyin-talend/master

TUP-1616 Refactoring after