Darvas box

Reference:

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

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

リリースノート:

Remove unused variable.

リリースノート:

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

リリースノート:

* bug fix: keep box active if limits only touched

リリースノート:

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