i.e. for all of the two-part nodes that have recently been converted
into single-part meshes and given new node names (with aliases).

material only) and make it from 5 tar + 4 marble (both from
building_blocks).

If moreblocks is installed (and technic isn't), this node is routed
through the stairsplus component, and a recipe is added that uses
moreblocks' own tar node also.

add sanity check to avoid cases in which expanded items would be placed against unknown nodes into other unknown nodes as pointed_think.above node
this resolves #205