fixed colspan in cronlist, added min-width in combobox table td, added new trigger in combobox for onclick autocomplete to submit

Implemented: FS#1113 - Force client to use only allowed IPs

- Enabled Security Level (Server Config > Web > Security Level) for nginx.

- Added escapeshellcmd to some paths in nginx_plugin.inc.php.

- Added SEO redirects (both Apache & nginx) to redirect from non-www website to www website or vice versa.
- Introduced placeholder [scheme] for redirect paths for alias and subdomains; will be replaced with http or https, depending on what the visitor uses.

- Fixed a bug in server settings rescue page.

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- Removed ufw firewall tab.

Fixed bug that caused the wrong list to be loaded when the return key was pressed in a search text field of a list.

combobox can send now focused with enter when a complete match exsits like 5 in priority in spamfilters

smaller tabs in no_image and 32x32, admin has under 1024 all tabs in 1 row and in no_image some space free for 2 more tabs

fieldset border-color set for all browsers @till blue looks in all colors bad with 1px, i used now gray + Remoteuser list, add user button has now a fieldset like every other form (i had without a problem in FF8)

- Fixed FS#1745.