title: Typo3 - remove default target in external menu item
body: <p>I have the below typoscript </p>
  
  <pre><code>lib.nav = HMENU
  lib.nav {
    wrap = &lt;ul&gt; | &lt;/ul&gt;
    1 = TMENU
    1 {
          expAll=1
          NO {
          |*| &lt;ul&gt;&lt;li&gt; | &lt;/li&gt;&lt;/ul&gt; |*| &lt;ul&gt;&lt;li&gt; | &lt;/li&gt;&lt;/ul&gt; || &lt;ul&gt;&lt;li class="last"&gt; | &lt;/li&gt;&lt;/ul&gt; |*|
  
              wrapItemAndSub = |*| &lt;li&gt; | &lt;/li&gt; |*| &lt;li&gt; | &lt;/li&gt; || &lt;li class="last"&gt; | &lt;/li&gt; |*|
              stdWrap.cObject = CASE
              stdWrap.cObject {
                  key.field = doktype
                  default = TEXT
                  default.field = title
                  default.typolink.parameter.data = field:uid
                  default.typolink.ATagBeforeWrap=0
                  3 &lt; .default
                  3 {
                  stdWrap.htmlSpecialChars = 1
                  typolink {
                  parameter {
                  data &gt;
                  dataWrap = http://{field:url}
              }
              }
          }
          }
            doNotLinkIt = 1     # to avoid "&lt;a&gt;" repeated twice
            subst_elementUid = 1
          }
        }
          2 = TMENU
        2 {
          expAll=1
          wrap = &lt;ul&gt; | &lt;/ul&gt;
          NO {
            wrapItemAndSub =  |*| &lt;li&gt; | &lt;/li&gt; |*| &lt;li&gt; | &lt;/li&gt; || &lt;li&gt; | &lt;/li&gt; |*|
            stdWrap.cObject = CASE
            stdWrap.cObject {
              key.field = doktype
              default = TEXT
              default.field = title
              default.typolink.parameter.data = field:uid
              default.typolink.ATagBeforeWrap=0
          3 &lt; .default
          3 {
          stdWrap.htmlSpecialChars = 1
          typolink {
          parameter {
          data &gt;
          dataWrap = http://{field:url}
          }
          }
          }
            }
            doNotLinkIt = 1     # to avoid "&lt;a&gt;" repeated twice
            subst_elementUid = 1
          }
        }
      }
  </code></pre>
  
  <p>Which seems to work well, however I have notice a slight glitch when I have an external url page in the nav.  It generates the below code for an external url.</p>
  
  <pre><code>&lt;ul&gt;
  &lt;li&gt;&lt;a href="index.php?id=3"&gt;External Links&lt;/a&gt;
      &lt;ul&gt;
          &lt;li&gt;&lt;a target="_top" href="http://example.com/1"&gt;Example 1&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a target="_top" href="http://example.com/2"&gt;Example 2&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a target="_top" href="http://example.com/3"&gt;Example 3&lt;/a&gt;&lt;/li&gt;
      &lt;/ul&gt;
  &lt;/li&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p>How do I remove this default setting? I want it to be configurable per page in the behaviour tab (link target field in LTS 4.5).</p>
  
  <p>I also have the below set in my constants.</p>
  
  <pre><code>PAGE_TARGET = 
  content.pageFrameObj = 
  </code></pre>