Change to use matplotlib's lim for zooming

closes #118 (closed)

When zooming before, downsample need to be recalculated and replot. With the reducing of data points, downsample isn't necessary anymore. SOHView now can use lim for zooming.

• Remove set_lim in PlottingWidget's subclasses.
• Recalculate total points for plot_time_dots, plot_multi_color_dots and plot_up_down_dots. (They were set when recreating axis before)
• Remove the condition to handle 'ax' or 'ax_wf' are already in c_data in SOHWidget and WaveformWidget. This case only takes place when a channel is replotted.

assigned to @ldam

requested review from @kienle

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• 9aa2310d - checking for key ax in plotting_data1's channel and remove artist only...

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• f5053b94 - change x0 to x_bottom, x_1 to x_top to be more descriptive
• 5815b0ce - fix typo in variable names
• 03bdd92c - add docstring to explain top and bottom labels for data points

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• 50967518 - remove checking for ax_wf in WaveforWidget.plot_single_channel() because...

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approved this merge request

mentioned in commit 8c498265

merged

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