Implement RFE "Non Required Fields on User Registration". Associated upgrade.

Minor streamlining of profile field listing methods.

WebGUI::Operation::Profile::getRequiredProfileFields is now deprecated,
because it's specific enough to be not significantly more useful than
WebGUI::ProfileField::getRequiredFields, and because with this change
nothing in core uses it anymore.

lib/WebGUI/i18n/English/WebGUIProfile.pm

@@ -341,6 +341,16 @@ new categories of profile settings.
                 message => "If set to yes, this form control will only allow image file types to be uploaded through it.",
                 lastUpdated => 1162945563
         },
+
+	'showAtRegistration label' => {
+                message => "Show at Registration?",
+                lastUpdated => 1164237018
+        },
+
+	'showAtRegistration hoverHelp' => {
+                message => "Show an entry for this field at the registration screen for newly-registering users.  The field will not actually be required unless Required is also set.",
+                lastUpdated => 1164237018
+        },
 };
 
 1;