13.16.10.1 Gesture Spec keyword changes

The following changes apply to the keywords which can be passed as the data in sys:make-gesture-spec :

• :prev is now :prev-item
• :next-item is new.
• On X11, "Sys_Req" now generates :sys-req (like it already does on Cocoa in LispWorks 5.1).

Also, the full set of keywords which sys:make-gesture-spec accepts are now documented.