PATH: post processor tweaks and loop select.

rename generic_post.py: This is actually a post specific to a machine.  The generic name is confusing
fix test case. Contour has no plunge angle
scrubbing postprocessors for python 2 style prints
Keep loop select usable when task panel is open.

src/Mod/Path/PathScripts/dynapath_post.py

@@ -180,7 +180,7 @@ def export(objectslist,filename,argstring):
     print("done postprocessing.")
 
     gfile = pythonopen(filename,"wb")
-    gfile.write(gcode)
+    gfile.write(final)
     gfile.close()