Darvas box

Reference:

tlc.thinkorswim.com/...ibrary/C-D/DarvasBox

Logic changed to transition to an active box after one higher low only.

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Remove unused variable.

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Changes:
* added top and bottom values to status line
* added optional labels for top and bottom values

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* bug fix: keep box active if limits only touched

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Added alerts for box breakout, break down and break in any direction.