Fix RT130 plot failing

Fix RT130 plot failing due to problem with plotting linked channels.

Closes #70 (closed).

requested review from @ldam

@kienle Please give me one data set with this problem to test

You can use 2011028.9AFA, 2013326.9E4A, 2016174.9AC4, or 2017149.92EB for testing.

@kienle I tested with 2011028.9AFA. It plots successfully. But when I zoom, there are some errors:

Traceback (most recent call last):
  File "/Users/ldam/Documents/GIT/sohstationviewer/sohstationviewer/view/plotting/plotting_widget/plotting_widget.py", line 382, in <lambda>
    QTimer.singleShot(1, lambda: self.zoom_bw_markers(xdata))
  File "/Users/ldam/Documents/GIT/sohstationviewer/sohstationviewer/view/plotting/plotting_widget/plotting_widget.py", line 262, in zoom_bw_markers
    self.set_lim()
  File "/Users/ldam/Documents/GIT/sohstationviewer/sohstationviewer/view/plotting/state_of_health_widget.py", line 177, in set_lim
    super().set_lim(first_time)
  File "/Users/ldam/Documents/GIT/sohstationviewer/sohstationviewer/view/plotting/plotting_widget/plotting_widget.py", line 475, in set_lim
    self.get_zoom_data(c_data, chan_id)
  File "/Users/ldam/Documents/GIT/sohstationviewer/sohstationviewer/view/plotting/state_of_health_widget.py", line 164, in get_zoom_data
    getattr(self.plotting, plot_functions[plot_type][1])(
  File "/Users/ldam/Documents/GIT/sohstationviewer/sohstationviewer/view/plotting/plotting_widget/plotting.py", line 96, in plot_multi_color_dots
    ax.plot(points, len(points) * [0], linestyle="",
UnboundLocalError: local variable 'points' referenced before assignment

added 9 commits

• e20413e4...edcab201 - 4 commits from branch master
• 30664e76 - Plot channels with linked channel last
• 43df824b - Make channels with linked channel not have main label
• fc717670 - Fix problem with plotting waveform data
• 5a5e80f6 - Fix problem with plotting Centaur data
• e4c57d13 - Fix problem when zooming

Compare with previous version

removed review request for @ldam

requested review from @ldam

approved this merge request

added 12 commits

• e4c57d13...49657765 - 7 commits from branch master
• d0117dc6 - Plot channels with linked channel last
• 31c6bf06 - Make channels with linked channel not have main label
• 7abb92e5 - Fix problem with plotting waveform data
• fac2fd03 - Fix problem with plotting Centaur data
• cea36a78 - Fix problem when zooming

Compare with previous version

merged

mentioned in commit 3025bd9e