improvement to Cut Plane

Move cut plane on itw own.
Add ArchCutPlan to CmakeList
Add task panel
Add choice between side of the face
+ fixes #0001829: DlgPrimitives replaces non ASCII charaters in objects Labels by ?
+ fixes #0001830: Gui.export() cannot handle long filenames
Work around for Mantis issue 0954 on Helix Primitive

To be removed after OCC helix bug corrected.
+ handle unicode strings in class PythonWrapper
+ fix issues on 64-bit Linux/MacOSX systems
+ minor fix
+ prepare for netgen 5.x support
make compatible with Part typed object

tool make a Part Cut object when object are not Arch typed.
the cutVolume is now Red and 75 transparence
add preview CutVolume in Arch CutPlane
Add PointOnObject constraints to 2-pane window
Path module: First commit

* Path.Command() object
Temporarily removed Gui from cmake
Path: Added Path object
Added Path Feature