add multiple line export feature (#7090)

* move permissions to top of page and use single database object

* use a domain array instead of session

* use a domain array instead of session

* add multiple line export feature
Exporting devices with multiple lines did not show headers for extra columns if the first device listed only had a single line and the other devices had multiple lines. This adds a feature to export multiple lines for devices using the "duplicate column feature" so that the import feature can detect and import all lines for the device.

* Update device_download.php

app/devices/device_imports.php

@@ -520,6 +520,7 @@
 	echo "    <select class='formfld' style='width:40px;' name='data_delimiter'>\n";
 	echo "    <option value=','>,</option>\n";
 	echo "    <option value='|'>|</option>\n";
+	echo "    <option value='	'>TAB</option>\n";
 	echo "    </select>\n";
 	echo "<br />\n";
 	echo $text['description-import_delimiter']."\n";