Log Message:
Updated cad/gtkwave to 3.3.88

3.3.88  20feb18 Added --sstexclude command line option to prune unwanted
                clutter from the SST window.
                Updated "/View/Mouseover Copies To Clipboard" menu \ 
option to
                copying signal names into the clipboard so they can be pasted
                into text editors, etc.
                Fixed Write Save File to handle getting confused by initial
                cancel then retry.
                Updated v2k input/output declarations to handle unpacked arrays.
                Fix for pattern marks that could overshoot the left marker.