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ILinePlot: Add default group for zoom sync

Darryl Green requested to merge github/fork/bjackman/iline-plot-default-group into master

Created by: bjackman

You currently have to specify a 'group' for the 'zync_zoom' parameter to work. However a likely use case is to plot multiple signals with a single ILinePlot call, and need them to be zoom-synced. For example, suppose we want to plot the frequency of all CPUs in a trace, on separate axes with zoom synced:

ILinePlot(ftrace, signals='cpu_frequency:frequency',
          pivot='cpu', drawstyle='steps-post',
          sync_zoom=True, group='my_group').view()

Here the use of 'my_group' seems unnecessary since it only occurs in one place.

Therefore use a hash of the ILinePlotGen object by default. This will make the above example work with 'group' omitted.

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