Fixed #4052 open_basedir contains client0 where it should contain client1 when value is taken from System default

if the filter rule uses "begins with", the regex should be "^$searchterm" instead of " $searchterm"

FS#2006 - IPv6 Support for V-Server

Removed possibility of reinstalling Instances

change sys_userid and sys_groupid for webdav users, web folders, web folder users, cron, database users and aps instances when domain's owner is changed