Temp folder util makes unclear assumptions

[solsson]

From #37

<h1>An error occurred</h1>
<p><em>Runtime error (code 8): tempnam(): file created in the system's temporary directory


<!-- Error level 8. Stack trace:
file	line	function
/srv/cms/rweb/repos-web/conf/System.class.php	489	tempnam
/srv/cms/rweb/repos-web/conf/System.class.php	169	_getSystemTemp
/srv/cms/rweb/repos-web/lib/smarty/smarty.inc.php	49	getApplicationTemp
/srv/cms/rweb/repos-web/conf/Presentation.class.php	191	smarty_getInstance
/srv/cms/rweb/repos-web/conf/Presentation.class.php	155	__construct
/srv/cms/rweb/repos-web/index.php	9	getInstance
 -->

</em></p>

Trying explicitly setting TMP in FPM pool config:

env[TMP] = /tmp

Try unsetting all (3?) env vars used for temp. Otherwise the fallback route using tempnam should be removed and throw explicit error.

[takesson]

It is working in our installations by setting env.