load frictions from file

src/View/ui/Frictions.ui

@@ -60,6 +60,7 @@
    <attribute name="toolBarBreak">
     <bool>false</bool>
    </attribute>
+   <addaction name="action_import"/>
    <addaction name="action_add"/>
    <addaction name="action_del"/>
    <addaction name="action_sort"/>
@@ -107,6 +108,18 @@
     <string>Ctrl+E</string>
    </property>
   </action>
+  <action name="action_import">
+   <property name="icon">
+    <iconset>
+     <normaloff>ressources/import.png</normaloff>ressources/import.png</iconset>
+   </property>
+   <property name="text">
+    <string>Import</string>
+   </property>
+   <property name="toolTip">
+    <string>Import from file</string>
+   </property>
+  </action>
  </widget>
  <resources/>
  <connections/>