Fix: move this to an external module in Doliforge

htdocs/includes/modules/modPaypal.class.php

@@ -79,7 +79,7 @@ class modPaypal extends DolibarrModules
 
 		// Dependencies
 		$this->depends = array();						// List of modules id that must be enabled if this module is enabled
-		$this->requiredby = array();	// List of modules id to disable if this one is disabled
+		$this->requiredby = array('modPaypalPlus');		// List of modules id to disable if this one is disabled
 		$this->phpmin = array(4,1);						// Minimum version of PHP required by module
 		$this->need_dolibarr_version = array(3,0,-2);	// Minimum version of Dolibarr required by module
 		$this->langfiles = array("paypal");