* Considerable clean-up of existing code.

* Moved the PSA import to the properties panel.

io_export_psk_psa/psk/importer.py

@@ -181,4 +181,9 @@ class PskImportOperator(Operator, ImportHelper):
         psk = reader.read(self.filepath)
         name = os.path.splitext(os.path.basename(self.filepath))[0]
         PskImporter().import_psk(psk, name, context)
-        return {'FINISHED'}
+        return {'FINISHED'}
+
+
+__classes__ = [
+    PskImportOperator
+]