Can serialization/microsoft_cfb.ksy be made more browsable?
Hi there, I'm evaluating using Kaitai Struct to build parsers for a couple of file formats related to Microsoft Office VBA. It's great that there already exists a `serialization/microsoft_cfb.ksy`, since the VBA binary files use that as a container format. But when I apply that `.ksy` to a file and browse, I'm not able to browse to specific streams and storages. Instead I see most file contents under `fat/entries` as an array of `s4`. I imagine it was done this way due to the actual streams potentially being fragmented within the structure.

Can Kaitai Struct actually deal with this sort of fragmentation, and the `.ksy` is just in need of some TLC? Or can it not, and thus it's not appropriate for this file format?

Version of `serialization/microsoft_cfb.ksy` I'm using: [microsoft_cfb.ksy.zip](https://github.com/kaitai-io/kaitai_struct/files/1117596/microsoft_cfb.ksy.zip)

Test file: [Designations.bin.zip](https://github.com/kaitai-io/kaitai_struct/files/1117597/Designations.bin.zip)

What I expect to see (tree of storages and streams):  
![image](https://user-images.githubusercontent.com/14240661/27767038-144dbbe0-5e9c-11e7-82a9-a03e1696c8a3.png)

What I actually see (flat list of `s4`):  
![image](https://user-images.githubusercontent.com/14240661/27767046-80ad2744-5e9c-11e7-9183-7015a96c0715.png)