[FIX]Added the missing icon and code to display updated trackers in module since_last_visit_new in that fancy jquery mode (how come I didn't know during so many years about that jquery mode?). Updated the icon for new tracker items accordingly to distinguish it from the other. Extra pieces of images taken from openclipart (public domain svg's)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49555 b456876b-0849-0410-b77d-98878d47e9d5
[MOD]Change icon for users from vcard (looks as if new contacts were added, in the feaure "contacts") to users indeed.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49557 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Jquery validation commonly added for antibots. Ref: http://dev.tiki.org/item5004

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@49558 b456876b-0849-0410-b77d-98878d47e9d5