doc todo
Bases: object
A vlab object is a directory containing a specification file, and a set of data.
Bases: core.vlab.VlabObject
Create an openalea package from a vlab object. First, read the specification file and parse it. Create the list of data, the list of editors, and the list of programs. Build the graph of dependencies. Compute the layout of the graph. Create a package with data and a composite node.