Restrict loading of ocl and PathSurface to enabling experimental features.

src/Mod/Path/InitGui.py

@@ -98,6 +98,7 @@ class PathWorkbench (Workbench):
 
             try:
                 import ocl # pylint: disable=unused-variable
+                from PathScripts import PathSurfaceGui
                 threedopcmdlist.append("Path_Surface")
                 threedcmdgroup = ['Path_3dTools']
                 FreeCADGui.addCommand('Path_3dTools', PathCommandGroup(threedopcmdlist, QtCore.QT_TRANSLATE_NOOP("Path",'3D Operations')))

src/Mod/Path/PathScripts/PathGuiInit.py

@@ -68,12 +68,6 @@ def Startup():
         from PathScripts import PathSimpleCopy
         from PathScripts import PathSimulatorGui
         from PathScripts import PathStop
-        try:
-            import ocl
-            from PathScripts import PathSurfaceGui
-        except ImportError:
-            import FreeCAD
-            FreeCAD.Console.PrintError("OpenCamLib is not working!\n")
         from PathScripts import PathToolController
         from PathScripts import PathToolControllerGui
         from PathScripts import PathToolLibraryManager