Add IGNORE_URLS code from agc@:
"If a URL is specified in IGNORE_URLS then all entries listed in
pkg-vulnerabilities that match that URL will not be reported when
audit-packages is run. Running audit-packages -v will display the
details of all entries skipped if IGNORE_URLS is set."
Add a sample audit-packages.conf detailing all the options we now support.
Update to 1.46