Fix: Removed not standard/compatible SQL. External module should not

have foreign keys with standard tables. This creates
dependencies and instabilities of core code. Integrity must be checked
by applications for external modules, not by database.

htdocs/install/mysql/migration/3.1.0-3.2.0.sql

@@ -272,7 +272,7 @@ ALTER TABLE llx_product_extrafields  ADD COLUMN import_key varchar(14);
 ALTER TABLE llx_societe_extrafields  ADD COLUMN import_key varchar(14);
 
 -- Disable foreign key checks for external modules constraints
-SET FOREIGN_KEY_CHECKS=0;
+--SET FOREIGN_KEY_CHECKS=0;
 
 DROP TABLE llx_c_currencies;
 create table llx_c_currencies
@@ -425,7 +425,7 @@ INSERT INTO llx_c_currencies ( code_iso, unicode, active, label ) VALUES ( 'XEU'
 INSERT INTO llx_c_currencies ( code_iso, unicode, active, label ) VALUES ( 'ARP', NULL, 0,	'Pesos argentins');
 INSERT INTO llx_c_currencies ( code_iso, unicode, active, label ) VALUES ( 'MXP', NULL, 0,	'Pesos Mexicans');
 
-SET FOREIGN_KEY_CHECKS=1;
+--SET FOREIGN_KEY_CHECKS=1;
 
 ALTER TABLE llx_propal ADD CONSTRAINT fk_propal_fk_currency		FOREIGN KEY (fk_currency) REFERENCES llx_c_currencies (code_iso);
 ALTER TABLE llx_commande ADD CONSTRAINT fk_commande_fk_currency	FOREIGN KEY (fk_currency) REFERENCES llx_c_currencies (code_iso);