XWIKI-9447: The group live table is not displayed correctly if a member is not visible for the current user
* Return doc_fullName from getgroupmembers.vm as it is expected by the live table when the document is not viewable.
* Separate the old properties from the live table date in getgroupmembers.vm
* Properly parse the document full name in live table when the document is not viewable.