Updated cad/gtkwave to 3.3.100

3.3.100 20mar19 FSDB fix for variable declarations of array of reals.
                Added Real, Time, Enum, and Popcnt flags to Edit/Show-Change.
                Ensure Show-Change regenerates analog traces.
                Added braces inside Tcl source command to allow spaces in
                filenames for Tcl scripts.

(mef)