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.
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