Merge pull request #42 from vauxoo-dev/8.0-addons-vauxoo-dev-julio

[IMP][account_move_line_base_tax] get value of base_amount like value ab...
Create README.md
[FIX][invoice_datetime] fixed error,  duplicate  and sign invoice with pac
Merge pull request #43 from vauxoo-dev/8.0-fix-copy-invoice-datetime-dev-ernesto

[FIX][invoice_datetime] Fixed error, duplicate and sign invoice with pac.
[IMP][sale_order_line_seq] Added groups to pruchase_price in sale order line and added by inherited style to enlarge the width of the sheet