[GRASS-PSC] Some Web page updates

[Markus Neteler]

Hi PSC,

given the new EU GDPR [1] coming into force on 25th of May 2018 I have
updated the privacy statements in the main GRASS GIS web site and in
the Wiki (the latter inspired by the respective Wikipedia pages). I
have also changed all mailman list admin entries from myself to
"grass-admin at osgeo.org" reflector. Whom else than me may I add to
this reflector?

cheers,
Markus

[1] https://ec.europa.eu/info/law/law-topic/data-protection/reform_en