title: Custom sitecolumns can't update
body: <p>I have made a ContentType in Visual Studio 2010 for my SharePoint 2010 project and the first time I deployed the wsp through the WSPBuilder there were no troubles but now every time I try to deploy, it keeps saying that it can't activate features because "<strong>The field with ID {<em>insert random guid here</em>} defined in feature {60938308-3563-497c-bc55-b2ae847ca8b8} (<em>the feature activating my contenttype on the site</em>) was found in a current site collection or in a subsite.</strong>"</p>
  
  <p>The contenttype and site columns gets created on the rootweb and even though I try to either deactivate the feature or completely uninstall it, the site columns and contenttype won't be deleted from the ContentType gallery or Site Columns gallery.</p>
  
  <p>How can this be?</p>
  
  <p>I use pure feature and XML functionality. No eventreceivers are involved.</p>