- cleanup unused code in OE_interfaceDisplay::mouse_Pos method

- change the way to make linestitch and birailstitch (trace only one segment by default, remove validation with "return" key)

  OE_actionScaleSelectedStitchLen
  OE_actionScaleSelectedStitchWidth
  OE_actionSetSelectedStitchPattern
- fix memory leaks when deleting meta actions:
  OE_actionScaleSelectedBirailStitchLen
  OE_actionScaleSelectedLineStitchWidth
  OE_actionScaleSelectedLineStitchLen
  OE_actionSetSelectedLineStitchPattern
  OE_actionSelectionClear

- add an option to warpStitch method to use 2 lines instead 1 line and 1 normal array

- fix a pan problem (2 time slower than the mouse move)
- add a backgroundColor in displayStyle

- fix a pan problem (2 time slower than the mouse move)
- add a backgroundColor in displayStyle

- add OE_actionDelPointLinkStitch and make it work

- make linkStitches point pickable

- remove the OE_commandDisplay class (specific functions are merged in OE_diplay)

- add a lot of displayStyle variables

- warpStitch include now x and y offset for pattern translation
- add xOffset and patternSteps attribute to linestitch and rename offset to yOffset

- set the OE_controler to use the SERIALPORT environment variable
- change the default creation values of linestitch lenth and width

- fix key mapping problem

- remove some old test functions in OE_controller

- add OE_controller::getSelectionBoundingBox function
- rename "select" function to "picking" in OE_interfaceDisplay (more clear name)
- change selection mode into an editionState in OE_interfaceDisplay
- add scale method to curves and stitchs
- add ScaleSelection state and implement the scale selection actions and UI widget
- clean and comment OE_interfaceDisplay
- add BoundingBox::getCenter method
- add OE_display::screenToDocument method

- store the len value of the birailStitch
- add the move function to staticStitch
- add getStitchStart and getStitchEnd method to OE_linkstitch
- fix a bug in OE_linkstitch::refresh method (it always put needRefresh to false)
- add double point motif to OE_linestitch
- add OE_actionDelStitch
- fix a bug in refreshDependency of most stitches and curves (does not refresh dependency of their own dependency)

- TODO write OE_actionScaleSelectedLineStitchWidth::scaleWidth and scaleLen methods

- add UI controls with numpad + - keys for width (+ctrl for len) and 1-> 6 for motif

- add actions for moves
- add - operator to vector_2d class