Norman rig "multiple" origins

Hi, I just downloaded Norman rig for Blender from here and there’s something I haven’t seen before. For example:

What are those green and blue lines? What are they for?
Also, about “multiple” origins:

That one big cross is named “root” so I suppose it should the be root bone but it doesn’t seem like it.
There is an empty called Meshes and what is it for? Is it normal? How should I move the mesh?

Anyone? :frowning: