Log Message:
Updated cad/gtkwave to 3.3.97

3.3.94  03sep18 Applied ghwlib.c patch for dealing with null ranges.
                Added second chance algorithm for find_dumpfile() in case
                it fails.
3.3.95  07oct18 Added fflush on stdout for help text as fix for possible
                stdout problem with mingw/msys shells.
                Added preliminary support for Time datatype.
                Warnings fixes for Verilator integration.
                Fixed install_proc_filter usage for Tcl invocation.
                Change integer type to "integer" in SST to differentiate it
                from sv ints.
                Premiminary support for enum tables embedded in FST files.
3.3.96  15nov18 Changed to standardized zoom in/out/full hotkeys.
                Added time backtracking warning (for partial mode) to lxt2vcd.
                VCD time backtracking fix (not for interactive mode).
                Added drag_failed handling (can press ESC) to DnD operations.
                Prevent missing file in savefile from causing savefile to be
                read as VCD by mistake.
                Changed to Dinotrace-like 0s/1s rendering for bit vectors so
                values can be discerned without seeing the full value text.
                Removed unneeded pango_layout_get_extents() inside call for
                font_engine_draw_string().
                Changed bsearch_trunc() to run in constant time when monospace
                fonts are in use.
                Added missing GDK_SCROLL_MASK to signal area (need for gtk3,
                but not for other versions for some reason).
3.3.97  23nov18 Need to set menu_wlist entry NULL on gtk_widget_destroy().
                Fix on vtype()/vtype2() to detect 'x' and make the coloration
                red on newly-displayed traces.  (Bug new from Dinotrace-like
                rendering in 3.3.96.)