Update online.php

Added PROCPS_FROMLEN=40 to increase the width of the user-address. Testing showed that my address was a whopping 26 chars, but only showed 16 chars (which is standard with w according to man).
Merge pull request #96 from armandg/patch-1

Support full IPv6 address in Online widget.

By default, w prints only 16 characters of the FROM column. Enough for
IPv4 but IPv6 can require up to 40.