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Multiple axis alignment control

There seems to be a lot of posts in the forum asking how to align the 0 values of multiple y axes.

My thoughts for implementing this:
Chart level option (like alignTicks): alignBaseline: boolean (default: true)
Axis level option: baseline:(numeric) (default: 0)

By default 0 is the baseline for each axis, and by default the 0 value for each axis is aligned.
The user can set the baseline to any other set of numbers that should be aligned, or turn off alignment.

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New experimantal implementation for Highcharts 4.1 is available at

This implementation looks a the threshold on the primary axis (the one first defined), and aligns the threshold of any following axis to that of the primary axis.

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