Master decimal rounding fix jar

Hello,

    Rename some Decimal Precision and Remove unused Decimal Precision .
    now have this decimal precision list:
                  Price
                  Quantity
                  Weight
                  Percentage
                  Amount

 -> Rename Precision
        Product Price ==> Price
        Product Unit of Measure ==> Quantity
        Product UOS ==> Quantity
        Stock Weight ==> Weight
        Account => for accounting, credit debit amount in journal items

 -> Remove Precision
       Account ==> Amount
       Discount ==> Price
       Payment Term ==> Price
       Payroll ==> Price
       Payroll Rate ==> Percentage.

    Add the new Decimal Precision in required field in the modules.

More details:
https://www.odoo.com/web?#id=5909&view_type=form&model=project.task&menu_id=3942&action=327
https://pad.odoo.com/p/r.37wvSpFHuUZQqdsG

Thanks,
Jaydeep Barot (JAR)