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Added magnetic data cursor#103

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siriuspal wants to merge 1 commit intojoferkington:masterfrom
siriuspal:add_magnetic_datacursor
Open

Added magnetic data cursor#103
siriuspal wants to merge 1 commit intojoferkington:masterfrom
siriuspal:add_magnetic_datacursor

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Added "Magnetic" Data Cursor keyword argument.

For artists with x and y attributes, such as line chart, magnetic will only create data cursor on a data point in chart.
By default the library creates cursors on interpolated lines between data points. This can be inconvenient in some cases where exact values of data points are needed.
If magnetic=True, cursor will be created to the data points closest to the mouse click by linear interpolation.

Tested the changes with all examples in the repository.
For artists which do not have x and y attributes (such as scatterplot, image) magnetic will not have any effect.

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