Fix Inherited flag of Subtype property to be true
Fix wrong BaseTypeId(that was ObjectTypeId) on creation of a content
Fix a bug that subtype property cannot be modified
Fix nullPointerException when executing "Check specification compliance" on the workbench

The check calls getChildren() with folderOnly flag = true, and null check is missing in that case.
Modify cmisVersionSupported value to 1.1
Set the correct baseTypeId of cmis:item

The wrong baseTypeId(which was cmis:policy) causes many errors in TCK.
Fix setContentStream that it can handle updateConflict exception

TCK changeTokenTest got an error.
The error is fixed now buy antoehr bug still remains because of TCK bug.