[TYPO3-core] RFC #17544: FIRST_INSTALL has no effect when typo3conf is not writable

[Peter Beernink]

Hi,

This is a SVN patch request.

Type:
Bugfix

Bugtracker reference:
http://bugs.typo3.org/view.php?id=17544

Branches:
4_4, 4_5, trunk

Problem:
In r8023 the FIRST_INSTALL file has been introduced which allows for 
easier install by creating the ENABLE_INSTALL_TOOL the first time.
However, when the typo3conf directory is not writable, this fails 
silently, causing the user to see the message no ENABLE_INSTALL_TOOL is 
found.

Solution:
Add check if the typo3conf/ direcotry is writable. If not, display a notice.

How to test:
Download and extract the introduction package. Make sure the typo3conf/ 
directory is not writable by the webserver.
Try to access the introduction package in a browser.

Greets,
Peter
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