- add some "const" in utils.h

Merge branch 'fiilings' of git@code.electrolab.fr:openEmbroidery/openEmbroidery_software.git into fiilings

# Conflicts:
#	include/OE_display.h
#	src/OE_interfaceDisplay.cpp

- 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

Conflicts:
	include/OE_utils.h
	src/OE_controller.cpp
	src/OE_interfaceDisplay.cpp

- add save and load of linkstitches steppoints in .oe files

Conflicts:
	include/OE_editDisplay.h
	include/OE_interfaceDisplay.h
	src/OE_editDisplay.cpp

- add OE_actionDelPointLinkStitch and make it work

- make linkStitches point pickable

- add actions for stepPoints functions

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

- add a lot of displayStyle variables

- make first and last point move together when form is closed

- fix a bug in PES loading (incorect stitch sequence)

Conflicts:
	include/OE_controller.h
	src/OE_controller.cpp

- 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