Allow extensions to suppress the popups for jqueryValidation

This means that scripts can suppress the nasty js alert message.

This isn't my ultimate preference - per long discussion here
eileenmcnaughton/nz.co.fuzion.omnipaymultiprocessor#128

I think being able to output a summary of messages near, or in place of, the paypal
checkout button makes more sense - open to better options @colemanw

Author: eileenmcnaughton

templates/CRM/common/l10n.js.tpl

@@ -118,7 +118,11 @@
       $.each(validator.errorList, function(k, error) {
         $(error.element).crmError(error.message);
       });
-    } else {
+    }
+    else if (CRM.vars.form.suppressAlerts) {
+      // Leaving it up to the script to display or otherwise.
+    }
+    else {
       alert({/literal}"{ts escape='js'}Please review and correct the highlighted fields before continuing.{/ts}"{literal});
     }
   };