Updates a client.
$session_id, $client_id, $reseller_id, $params
Parameters (in $params):company_name (varchar(64))
contact_name (varchar(64))
customer_no (varchar(64))
vat_id (varchar(64))
street (varchar(255))
zip (varchar(32))
city (varchar(64))
state (varchar(32))
country (char(2))
telephone (varchar(32))
mobile (varchar(32))
fax (varchar(32))
email (varchar(255))
internet (varchar(255))
icq (varchar(16))
notes (text)
default_mailserver (int(11))
limit_maildomain (int(11))
limit_mailbox (int(11))
limit_mailalias (int(11))
limit_mailaliasdomain (int(11))
limit_mailforward (int(11))
limit_mailcatchall (int(11))
limit_mailrouting (int(11))
limit_mailfilter (int(11))
limit_fetchmail (int(11))
limit_mailquota (int(11))
limit_spamfilter_wblist (int(11))
limit_spamfilter_user (int(11))
limit_spamfilter_policy (int(11))
default_webserver (int(11))
limit_web_ip (text)
limit_web_domain (int(11))
limit_web_quota (int(11))
web_php_options (varchar(255))
limit_web_subdomain (int(11))
limit_web_aliasdomain (int(11))
limit_ftp_user (int(11))
limit_shell_user (int(11))
ssh_chroot (varchar(255))
limit_webdav_user (int(11))
default_dnsserver (int(11))
limit_dns_zone (int(11))
limit_dns_slave_zone (int(11))
limit_dns_record (int(11))
default_dbserver (int(11))
limit_database (int(11))
limit_cron (int(11))
limit_cron_type (enum('url','chrooted','full'))
limit_cron_frequency (int(11))
limit_traffic_quota (int(11))
limit_client (varchar(64))
parent_client_id (int(11))
username (varchar(64))
password (varchar(64))
language (char(2))
usertheme (varchar(32))
template_master (int(11))
template_additional (varchar(255))
created_at (bigint(20))
Output:Returns the number of affected rows.