Fix gps lk unlk plotting - coloring, positioning label

closes #109 (closed)

• Adjust relative position between GPS Lk/Unlk and GPS Clock Power, separate data of GPS to 2 groups for sample numbers display
• From different plots, give different colors that match with plot and different position for displaying sample numbers.

sohstationviewer/view/plotting/plotting_widget/plotting.py

@@ -177,7 +177,8 @@ class Plotting:
         ax.set_ylim(-2, 2)
         self.plotting_axes.set_axes_info(
             ax, [len(points_list[0]), len(points_list[1])],
-            sample_no_colors=colors,
+            sample_no_colors=[clr[colors[0]], clr[colors[1]]],
+            sample_no_pos=[0.25, 0.75],
             chan_db_info=chan_db_info, linked_ax=linked_ax)
         if linked_ax is None:
             ax.x = x
@@ -269,6 +270,7 @@ class Plotting:
                 obj, c = cStr.split(':')
                 colors[obj] = c
         l_color = 'G'
+        d_color = 'W'
         has_dot = False
         if 'L' in colors:
             l_color = colors['L']