pfSense

Ticket #6096: Add PKG_DBDIR and PKG_CACHEDIR to user environment

Simplify tcsh prompt and respect default terminal colors

Move copyright from ESF to Netgate

Review license / copyright on all files (1st round)

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/