Revert "Fix SPEC #7013 : use database type "numeric" to store monetary values"

htdocs/install/mysql/migration/6.0.0-7.0.0.sql

htdocs/install/mysql/tables/llx_accounting_bookkeeping.sql

htdocs/install/mysql/tables/llx_blockedlog.sql

htdocs/install/mysql/tables/llx_chargesociales.sql

htdocs/install/mysql/tables/llx_commande.sql

htdocs/install/mysql/tables/llx_commande_fournisseur.sql

htdocs/install/mysql/tables/llx_don.sql

htdocs/install/mysql/tables/llx_loan_schedule.sql

htdocs/install/mysql/tables/llx_paiementcharge.sql

htdocs/install/mysql/tables/llx_paiementfourn.sql

htdocs/install/mysql/tables/llx_payment_donation.sql

htdocs/install/mysql/tables/llx_payment_expensereport.sql

htdocs/install/mysql/tables/llx_payment_loan.sql

htdocs/install/mysql/tables/llx_payment_salary.sql

htdocs/install/mysql/tables/llx_prelevement_bons.sql

.../install/mysql/tables/llx_prelevement_facture_demande.sql

htdocs/install/mysql/tables/llx_prelevement_lignes.sql

htdocs/install/mysql/tables/llx_societe.sql

htdocs/install/mysql/tables/llx_tva.sql