Renew GtkWave save file.

GtkWave has apparently changed its save file format without
backwards compatibility. Content should be the same as before.

testcases/save-file-velocities.gtkw

@@ -1,40 +1,50 @@
 [*]
-[*] GTKWave Analyzer v3.3.49 (w)1999-2013 BSI
-[*] Thu Dec  5 14:38:51 2013
+[*] GTKWave Analyzer v3.3.66 (w)1999-2015 BSI
+[*] Sun Nov 27 14:06:58 2016
 [*]
-[dumpfile] "/home/mah/RepRap/Teacup_Firmware/testcases/straight-speeds.processed.vcd"
-[dumpfile_mtime] "Thu Dec  5 13:58:58 2013"
-[dumpfile_size] 90396188
-[savefile] "/home/mah/RepRap/Teacup_Firmware/testcases/savefile-velocities.gtkw"
+[dumpfile] "/home/mah/RepRap/Teacup_Firmware/testcases/short-moves.processed.vcd"
+[dumpfile_mtime] "Sun Nov 27 12:09:59 2016"
+[dumpfile_size] 165535
+[savefile] "/home/mah/RepRap/Teacup_Firmware/testcases/save-file-velocities.gtkw"
 [timestart] 0
 [size] 1000 600
-[pos] -1 -1
-*-34.270847 2493458200 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
-[sst_width] 199
-[signals_width] 191
+[pos] 266 225
+*-29.874165 730551150 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
+[treeopen] Steppers.
+[sst_width] 206
+[signals_width] 157
 [sst_expanded] 1
-[sst_vpaned_height] 156
-@88022
-Steppers.X_steps/s[15:0]
+[sst_vpaned_height] 163
+@28
+Steppers.X_step
+@88024
+Steppers.X_steps/s
 @20000
 -
 -
 -
+-
 @24
-Steppers.X_pos_steps[15:0]
-Steppers.X_pos_um[15:0]
-Steppers.X_mm/min[15:0]
+Steppers.X_mm/min
+@420
+Steppers.X_pos_steps
 @200
 -
-@88022
-Steppers.Y_steps/s[15:0]
+-
+@20000
+-
+@28
+Steppers.Y_step
+@88025
+Steppers.Y_steps/s
 @20000
 -
 -
 -
+-
 @24
-Steppers.Y_pos_steps[15:0]
-Steppers.Y_pos_um[15:0]
-Steppers.Y_mm/min[15:0]
+Steppers.Y_mm/min
+@420
+Steppers.Y_pos_steps
 [pattern_trace] 1
 [pattern_trace] 0