Prepare to build installer 2.4.0.
Adapt to the new files structure.
The release number of all tasks matches with the release number of the agent.
The option 'backend-collect-timeout' has been changed by 'collect-timeout'.

Now the option 'backend-collect-timeout' is deprecated.
The option 'html' is deprecated.

The option 'no-html' is deprecated too.
The option 'local' is deprecated.
Integrate and manage the new task 'Collect'.