Fixing crashes with register_recipe function
- Atelier enable (again)
- Recipes' registering function fixed
- Inventory's menus using better names
	outil 	=> input
	aot 	=> output
	oti	=> tool
- Moving things in outil menu's slot's piece of code debuggued
- Code now using new names
Fixing moving
- Atelier block now (quite) works

TODO: Use tools (decrease wear of them) and duration
Fixing a few TODO stuff
- Full conversion works, including tool's wear dicrease, except duration
- Adding more security on register_recipe function
- Fixing FormSpec little problems

Signed-off-by: LeMagnesium <mg.minetest@gmail.com>
Merge http://github.com/Ataron/bijoux

Conflicts:
	bijoux/atelier.lua