Fix the compile error with ERAttachmentUploadQueue (closes #545)

The current implementation doesn't require unchecked casts and compiles correctly with JDK 6 and JDK 7.
some missing API files
correct selection on ERXDisplayGroup

Last changes to ERXDisplayGroup resulted in incorrect selection when using batching as in that case _displayedObjects and displayedObjects() give you different data. This patch uses reflection instead of altering the newSelection array for performance reasons.
Update ERAttachmentUploadQueue.java
2. Test commit from goetz's eclipse
Fix a syntax error ERAttachmentQueueEntry and ERAttachmentUploadQueue
that prevented Wonder from building
Merge with upstream
Merge branch 'master' of https://github.com/AppWonder/wonder.git