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Use the correct access when computing bounded y-values for constrained panning.

Dygraphs was computing the second y-axis using extreme range of the first y-axis. This fixes bug 294, setting panEdgeFraction to non-zero breaks secondary y-axis label computation.

Also add a minor optimization by moving a computation outside the axis loop.
Fix wrong values in legend when using stackedGraph with missing values
Consider all the series when searching previous stacked one and use Dygraph.isValidPoint to validate the point (not just !yval)
See http://jsfiddle.net/6W7EQ/2/
Merge pull request #224 from kberg/i294

Use the correct access when computing bounded y-values for constrained panning.
Merge pull request #225 from vlsi/master

Fix wrong values in legend when using stackedGraph with missing values
Fixed computation of stacked series in case some series start in the middle of the range
The bug is caused by stale value of last_x local across loop in gatherDatasets_.
See https://code.google.com/p/dygraphs/issues/detail?id=438
Add tests for underlayCallback with no series.
Merge branch 'master' of https://github.com/danvk/dygraphs
Fix value of yMax in callback.js test.
Added tests for explicit y axis range in callback.
Merge pull request #229 from clocksmith/master

Fix the bug intorduced from adding ypad and ypadCompat to no longer return NaN values for the yAxisRange. Test added to guarantee that the underlay callback is called even when there are no series and that the yAxisRange is valid.
Fix syntax error in callback.js
Merge pull request #230 from clocksmith/master

Fix broken test file
Fix for issue #439
Merge pull request #231 from paulfelix/master

Fix for Issue 439: Dragging a range Selector grab handle is not working properly when graph's position on page is offset
Merge pull request #226 from vlsi/wrong_stacked_computation

Fixed computation of stacked series in case some series start in the mid...