Fix missing dependency
Use the same order of definition than the use
Add target to clean the .elc compilation files
Refactor - Move functions to their dedicated namespaces
Doc - fix doc convention
Fix missing require statement
Refactor - Simplify code
Remove useless comments
Refactor - Rename the todo-TEST-simple.org to TESTS-simple.org
Fix bindings to C-c o L.
Fix on checkbox level computation.
  - [X] Doc - Update docstring to standard emacs convention
  - [X] Fix org-trello to make it work again