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/model/reftek/log_info.py

@@ -457,7 +457,7 @@ class LogInfo():
             elif "EXTERNAL CLOCK IS UNLOCKED" in line:
                 epoch = self.simple_read(line)[1]
                 if epoch:
-                    self.add_chan_info('GPS Lk/Unlk', epoch, 0, idx)
+                    self.add_chan_info('GPS Lk/Unlk', epoch, -1, idx)
             elif "EXTERNAL CLOCK IS LOCKED" in line:
                 epoch = self.simple_read(line)[1]
                 if epoch: