[birt-dev] Checkin: fix bugzilla #115946- Embedden image in grid in libr

["Chenzhong Yu" <cyu@xxxxxxxxxxx>]

Title: Checkin: fix bugzilla #115946- Embedden image in grid in library cannot extends in report

- Summary:
Return the image name with library namespace if it is child image, or
it is inside a child element.

- Bugzilla Bug (s) Resolved:[Bugzilla]115946

- Description:

- Tests Description  :

- Files Edited:

- Files Added:

 - Files affected: 
    /home/birt/source/org.eclipse.birt.report.model/test/org/eclipse/birt/report/model/api/input/Library_2.xml,v  <--  Library_2.xml

    /home/birt/source/org.eclipse.birt.report.model/test/org/eclipse/birt/report/model/api/input/ImageItemHandleTest.xml,v  <--  ImageItemHandleTest.xml

    /home/birt/source/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ImageHandle.java,v  <--  ImageHandle.java

    /home/birt/source/org.eclipse.birt.report.model/test/org/eclipse/birt/report/model/api/ImageHandleTest.java,v 

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