[birt-dev]CheckIn: Fix Bugzilla Bug 153032 --- Table or Grid cell suppor

["Wei Zhao (Shang)" <wei.zhao@xxxxxxxxxxx>]

Title: [birt-dev]CheckIn: Fix Bugzilla Bug 153032 --- Table or Grid cell support drop feature

- Summary:
The drop be set in table group header is effective, otherwise, not effective.

- Bugzilla Bug (s) Resolved:
Fix Bugzilla Bug 153032 --- Table or Grid cell support drop feature

- Description:
We only support the drop be set in table group header.

- Tests Description  :
Manual Test

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:  
 
- Notes to Documentation:  

- Files Edited:
"/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java"

- Files Added:

- Files Deleted

-Wei Zhao(Shanghai)