DocuBricks structure -- handeling multiple top bricks

[MakerTobey]

Currently, the structure works only (at least in with the current viewer), when having one single top brick and when listing sub bricks in a quantity >=1. Let us think is this is the only use case and fix possible issues. If not, we need to clarify this on our Webpage.

[rwb27]

With the new online viewer, multiple top-level bricks are shown OK, I think. Don't know how it's working on the website... I notice there is some provision in the code for specifying "views" of how the bricks are displayed, but it's not used...