improve project with doc and control
New service to get a unique interpreter ipython.
Fix some bugs in tests.
move lpy dependencies into plantlab
restore picklable curves remove by mistake
lpy model has a default input
fix error with name inside prepare_inputs
remove unused part in test
Move loader and saver (plantgl dependent AND unused) in legacy.
Fix setup.py s.
Move lpy controls into plantlab.
Fix misspelling.
add test to service interpreter
Merge pull request #76 from jucoste/interpreter

New service to get a unique interpreter ipython.
Auto Focus is enabled by default.
It can be disabled in Viewer menu.
Merge pull request #80 from gbaty/autofocus

Auto Focus is enabled by default.
Merge pull request #77 from jucoste/rm_lpy_dependencies_oalab

Remove dependencies to lpy into core and oalab
Project: add items method to return all items for a category
Add meta information for project categories
Use dynamic approach to display project summary
Save project after metadata changes
Rename project properties "category_keys" and "metadata_keys"
Merge pull request #81 from gbaty/dynamic_project_preview

Dynamic project preview
Merge pull request #78 from jucoste/improve_tuto_koch

Improve project tutorial_models (Koch)