Path: py3 fixes

Needed for unit tests to pass

src/Mod/Path/PathScripts/PathLoadTool.py

@@ -26,12 +26,12 @@
 import FreeCAD
 from FreeCAD import Units
 import FreeCADGui
-import PathUtils
 import Path
 import Part
 import PathScripts
 from PySide import QtCore, QtGui
 import PathScripts.PathLog as PathLog
+import PathScripts.PathUtils as PathUtils
 
 LOG_MODULE = 'PathLoadTool'
 PathLog.setLevel(PathLog.Level.INFO, LOG_MODULE)
@@ -194,7 +194,7 @@ class CommandPathLoadTool:
         PathLog.track("tool: {} with toolNumber: {}".format(tool, toolNumber))
 
         import PathScripts
-        import PathUtils
+        from PathScripts import PathUtils
 
         obj = FreeCAD.ActiveDocument.addObject("Path::FeaturePython", "Default Tool")
         PathScripts.PathLoadTool.LoadTool(obj)

src/Mod/Path/PathScripts/PathPostProcessor.py

@@ -34,13 +34,23 @@ class PostProcessor:
     @classmethod
     def load(cls, processor):
         postname = processor + "_post"
-
-        exec("import %s as current_post" % postname)
+        namespace = {}
+        
+        #can't modify function local scope with exec in python3
+        exec("from PathScripts import %s as current_post" % postname, namespace)
+        current_post = namespace['current_post']
+        
         # make sure the script is reloaded if it was previously loaded
         # should the script have been imported for the first time above
         # then the initialization code of the script gets executed twice
         # resulting in 2 load messages if the script outputs one of those.
-        exec("reload(%s)" % 'current_post')
+        try:
+            # Python 2.7
+            exec("reload(%s)" % 'current_post')
+        except NameError:
+            # Python 3.4+
+            from importlib import reload
+            exec("reload(%s)" % 'current_post')
 
         instance = PostProcessor(current_post)
         instance.units = None

src/Mod/Path/PathScripts/PathSelection.py

@@ -25,7 +25,7 @@
 
 import FreeCAD
 import FreeCADGui
-import PathUtils
+import PathScripts.PathUtils as PathUtils
 import PathScripts.PathLog as PathLog
 
 LOG_MODULE = 'PathSelection'

src/Mod/Path/PathScripts/PathToolLibraryManager.py

@@ -30,7 +30,7 @@ import Path
 import os
 from PySide import QtCore, QtGui
 import PathScripts
-import PathUtils
+from PathScripts import PathUtils
 
 import PathScripts.PathLog as PathLog
 

src/Mod/Path/PathScripts/PathUtils.py

@@ -30,7 +30,7 @@ from DraftGeomUtils import geomType
 import PathScripts
 from PathScripts import PathJob
 import numpy
-import PathLog
+from PathScripts import PathLog
 from FreeCAD import Vector
 import Path
 from PySide import QtCore