1/lookup:
a/ NetGeo online request using download_file_content() by default
b/ GeoLite City local binary data file optional - must be downlaoded/extracted/installed into moodledata/geoip
2/ visialization:
a/ by default image from ipatlas + css marker
b/ Google Maps with marker - admins must register sites to get Google Maps API key
3/ remove all old plugins
4/ add admin settings and info