[TYPO3-core] RFC #14337: "The install tool is locked" doesn't send No-Cache headers

[Steffen Gebert]

Hi,

This is a SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=14337

Branches:
trunk

Problem:
The message "The install tool is locked" isn't sent with the according  
headers, to force the browser to revalidate the page, once it's accessed  
again.
Thus the user has to reload the frame, to access it, after install tool is  
unlocked.

Solution:
> +	header('Cache-Control: no-cache, must-revalidate');
> +	header('Pragma: no-cache');

How to reproduce:
This occurs for me in Firefox, while beeing logged in into the Backend and  
accessing the install tool using Admin tools > Install.

Steffen
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