Material: Material editor enhancements

Improves compatibility when using the legacy editor.

Corrects a number of issues that prevented saved files from being displayed when using the legacy editor.

Reduces the verbosity of console messages.

src/Mod/Material/materialtools/cardutils.py

@@ -271,14 +271,11 @@ def import_materials(category='Solid', template=False):
         fluid = ('1ae66d8c-1ba1-4211-ad12-b9917573b202' in physicalModels)
         if not fluid:
             path = mat.LibraryRoot + "/" + mat.Directory
-            print(path)
+
             materials[path] = mat.Properties
             cards[path] = mat.Name
             icons[path] = mat.LibraryIcon
 
-            print(path)
-            print(mat.Properties)
-
     return (materials, cards, icons)
 
 def add_cards_from_a_dir(materials, cards, icons, mat_dir, icon, template=False):