[birt-dev] Checkin: change to model new API, fix drag parameter error.

["Yuejie Chen" <yuejie.chen@xxxxxxxxxxx>]

- Summary: change to model new api, fix drag parameter error.

- Bugzilla Bug (s) Resolved:
NONE
- Description:
1. Use new moded api to create ComputedColumn.
2.fix drag parameter not add data binding error

- Tests Description:

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:

- Notes to Documentation:

- Files Edited:

/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dnd/InsertInLayoutUtil.java
/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/views/attributes/provider/DataSetColumnBindingsFormHandleProvider.java

- Files Added:

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