Add new service "data" to embed data file
First draft for Project API v2
Improve data service and tests
Project2 now support add and auto load.
Changes in data API
Simplify parse model code function
Add missing test data
remove unused tests
Add Project2.save
fix tests
Remove required parameter "name" in data service and Data class because this parameter was never used
add test project2.rename
Add project.rename
Add Project.move, Project.rename.

Remove ambiguous attribute name:
  - name in sense of project dirname can be get with project.path.name
  - name in sense of project name for user can be get with project.alias or project.metadata['alias']
Add Project.start and convenience properties
add tests project2 (remove_data, repr, set_attr, ...)
add doc project
Add Path.normlink(): replace symlink by real paths
Define an entry_point to specify project repositories
Clean ProjectManager (more features, less code)
Remove project tests with dependency to plantgl or lpy