[GRASS5] Some web site cosmetics

Hi,

for convenience I have added menu footers to many web
pages at the GRASS master site

http://grass.itc.it/index2.html

This will appear on the mirror sites tomorrow (after the nightly
updates). Hopefully the navigation is a bit easier now.

I would welcome one or more volunteers to help with
web site management.

Best regards

Markus Neteler