Add meta data for the poor little sdk user.
Alter doc.
Fix time format.
Quick fix of collection data structure.
Remove useless return.
Set class in meta.
Add id in presence
Manage already sent of not.
Add missing class typing.
Implement inject collection.
Fix documentation.
Stub of crop collection time.
Add classes for file access right management.

Slight code improvements (style, lint, clean methods).