move private key methods from wallet to accounts

gui/qt/main_window.py

@@ -1077,7 +1077,7 @@ class ElectrumWindow(QMainWindow):
                 menu.addAction(_("Private key"), lambda: self.show_private_key(addr))
                 menu.addAction(_("Sign/verify message"), lambda: self.sign_verify_message(addr))
                 #menu.addAction(_("Encrypt/decrypt message"), lambda: self.encrypt_message(addr))
-            if addr in self.wallet.imported_keys:
+            if self.wallet.is_imported(addr):
                 menu.addAction(_("Remove from wallet"), lambda: self.delete_imported_key(addr))
 
         if any(addr not in self.wallet.frozen_addresses for addr in addrs):

gui/qt/password_dialog.py

@@ -124,6 +124,8 @@ class PasswordDialog(QDialog):
         try:
             self.wallet.update_password(password, new_password)
         except:
+            import traceback, sys
+            traceback.print_exc(file=sys.stdout)
             QMessageBox.warning(self.parent, _('Error'), _('Failed to update password'), _('OK'))
             return