Fix: field to store amount must be double(24,8)

Necessary for future hrm module.

Avoid error in loading data and also loading data which not be to.

id, text and date end.

- Add module for batch number management
- change dependency for stock and product
- change product class and fiche showing new select for batch managment on product

adding burundi in pays database

customer, if MAIN_FEATURES_LEVEL=2 Price by qty)
- Fix: Project Task numbering rule customs rule works

We keep bic size field to 20 instead of 11 for backward compatibility.

http://www.dolibarr.fr/forum/12-howto--aide/47966-pcmn-plan-comptable-minimum-normalise-belgique

http://wiki.dolibarr.org/index.php/Language_and_development_rules#SQL_rules

new field "ref" present on update sql but not on the table