nowrap in list + fixes combobox + remove ugly round cornors + move additional css -> combobox looks more like ISPConfig

- Added "actions" framework in server to replace the functions provided by the core modules
- Moved system update function from remoteactins core module to software update plugin.

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

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 #681 - removed all onblur, checked onchange for function and removed it in filter panels. Added jquery keypress (event 13 -> enter) and tested it in different browsers

Missing div ending and clean up footer tabbing