Update of the Lua Stimulator box

[yrenard]

Dear Lua Stimulator users,

I'd like to underline a significant update of this box (turning it to the stable status). As announced in the documentation of the initial box, a few number of changes have been applied to the API (detailed in the dedicated documentation page). I invite all the scripters to read these changes and to upgrade their scripts. The API can now be considered as stable.

I hope this makes that box more useful and powerful.
Yann