fix the error-output to write a valid php-file / #2999

This file is viewable by system info page and should have:

1. proper user authentication checking (only admins could see this page, I'm not sure, maybe PM managers too),
2. proper header with code page (currently this page does not have any header) - based on person language (we use utf-8).

The "system info" and the errors.log page is only accessible for Admins. The structure of the file itself will be changed into a valid php file.

Doing any more right checks would be too much of an effort. Adding an valid header to the file... Well... I mean... The error.log parsing is already... well... I mean it's just a fucking log file!

I will fix the readability by:

• adding <?php at the beginning
• starting all lines with #

That's it. I think we have a lot more to do than adding a valid header to the errors.log file ;-)

but adding the code in my first comment just sends the browser to the starting page. Thus users without mod_rewrite don't get exposed to this kind of security hole. And all you have to do is skip first line with parsing for admin-info...