Move Jenkins URL to its own section in the global configuration

The URL is used in many more places than just E-mail Notification, but people who do not send emails from Jenkins tend to overlook it and do not think it is a setting that will affect them.

changelog.html

@@ -63,6 +63,8 @@ Upcoming changes</a>
     (<a href="http://issues.jenkins-ci.org/browse/JENKINS-9281">issue 9281</a>)
   <li class=rfe>
     Added two new CLI commands "wait-node-online" and "wait-node-offline" to block until a slave becomes online/offline.
+  <li class=rfe>
+    Move Jenkins URL setting from E-mail Notification to its own section in the main configuration.
 </ul>
 </div><!--=TRUNK-END=-->
 

core/src/main/resources/hudson/tasks/Mailer/global.jelly

@@ -23,6 +23,11 @@ THE SOFTWARE.
 -->
 
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
+  <f:section title="${%Jenkins URL}">
+    <f:entry title="${%Jenkins URL}" field="url">
+      <f:textbox default="${h.inferHudsonURL(request)}" />
+    </f:entry>
+  </f:section>
   <f:section title="${%E-mail Notification}">
     <f:entry title="${%SMTP server}" field="smtpServer">
       <f:textbox />
@@ -33,9 +38,6 @@ THE SOFTWARE.
     <f:entry title="${%System Admin E-mail Address}" field="adminAddress">
       <f:textbox />
     </f:entry>
-    <f:entry title="${%Jenkins URL}" field="url">
-      <f:textbox default="${h.inferHudsonURL(request)}" />
-    </f:entry>
     <f:advanced>
       <f:optionalBlock name="useSMTPAuth" title="${%Use SMTP Authentication}" checked="${descriptor.smtpAuthUserName!=null}"
           help="/help/tasks/mailer/smtpAuth.html">

core/src/main/resources/hudson/tasks/Mailer/help-url.html

 <div>
   Optionally specify the HTTP address of the Jenkins installation, such
   as <tt>http://yourhost.yourdomain/jenkins/</tt>. This value is used to
-  put links into e-mails generated by Jenkins.
+  let Jenkins know how to refer to itself, ie. for links to images and
+  links in emails.
 
   <p>
   This is necessary because Jenkins cannot reliably detect such a URL