[DXAtlas export] Fix for some systems when writing temp file

application/controllers/Dxatlas.php

@@ -108,7 +108,7 @@ class Dxatlas extends CI_Controller {
 		if(!$this->user_model->authorize(2)) { $this->session->set_flashdata('notice', 'You\'re not allowed to do that!'); redirect('dashboard'); }
 		$zipFileName = 'dxatlas_gridsquares_'. $band . '.zip';
 		// Prepare File
-		$file = tempnam("tmp", "zip");
+		$file = tempnam(".", "zip");
 		$zip = new ZipArchive();
 		$zip->open($file, ZipArchive::OVERWRITE);