correction of broken css-class for dashboard warnings + add of state-icon for dashboard warnings + removal of empty <p>-element in dashboard warnings

changed server_list display to usage of sprite images + reduction of hardcoded <br>-elements + additional support for distro icons in server_list

added .label + .value class for non-INPUT details in edit forms; changed class for measurement unit to .label -> better output + reduction of unnecessary non-breaking spaces