Feature/sale distribution consumable

- In this PL we add the column `is_distributable` in the table `sale` in bhima.sql
- We list only distributions which are distributable (`si_distributable=1`) in `Stock_managment/Stock distribution` 
- We fixed the button `view sale details` in `Stock_managment/Stock distribution` 
This should probably be done as a condition on MySQL query.  That way, we do not download unused data.