Fix the wrong extrusion amount for infill when using a odd wall thickness.
Fix the "object turns black" bug.
Slightly adjust the default 3 profiles.
Update the defualt profile qualities to better reflect what the machine can do.
Fix dual-extrusion with different model heights.
added start script in /usr/bin
Merge pull request #402 from oni303/master

added start script for debian
Do not show duplicate menu when no object is selected.
Hide tools when no object is selected.
Add working scale up to machine size.
Add lay-flat code.
Do not show the merge menu when no object is selected.
Make the popup menu code more general, add a delete option to the menu. Fix the popup menu showing when turning the camera.
Add layer changing with keyboard when viewing GCode.
Update the default profiles so they reflect better what an Ultimaker can do.
Merge branch 'master' into SteamEngine

Conflicts:
	Cura/slice/__main__.py
	Cura/slice/cura_sf/fabmetheus_utilities/settings.py
Add proper head size code for scene planning. Fixed reset rotation.