Include Hooks outside of the content

[moz0817]

Issue Description

In my opinion, the include hooks pageheader.html and pagefooter.html are not positioned correctly. Those data should be displayed directly above or below the content.
At the moment, however, it is displayed above the navigation or below in the page information.

I would be happy if this were changed (affects main.php lines 280 to 380):

• tpl_includeFile('pageheader.html') directly above tpl_content(false)
• tpl_includeFile('pagefooter.html') directly after echo template::getInstance()->getInclude( 'footer', ...