pfSense

Improve interactive shell detection to cover other terminal types

Add dot.hushlogin to skeleton directory to create file for all new users and avoid them to see motd

Introduce read_xml_tag.sh

Create /usr/local/sbin/read_xml_tag.sh, that will read a xml tag from
config file using xmllint. Replace all direct read using cat, grep, sed,
... by this script

Move main pfSense content to src/