Add grapheditor and visualea to multisetup.py
Minor changes in dataflowview
Add visualea and grapheditor to repository
Add a "default" lab used if oalab is installed without plantlab.
Disable plantlab by default: without plantlab, OpenAleaLab works out of the box: no more dependencies to gforge/openalea nor gforge/vplants
Move tests dependings and LPy/PlantGL to plantlab
Merge pull request #101 from gbaty/add_visualea

Add visualea & grapheditor from gforge