cleaned up the missing helper storage class

src/qtgui/preview_w.cpp

@@ -766,7 +766,7 @@ class LoadThread : public QThread {
 		imgtmp = interner.get_imgtmp();
 	    } else {
 		out.mimetype = interner.getMimetype();
-		interner.getMissingExternal(&mst, missing);
+		mst.getMissingExternal(missing);
 		*statusp = -1;
 	    }
 	} catch (CancelExcept) {

src/qtgui/rclmain_w.cpp

@@ -1127,11 +1127,11 @@ void RclMain::showActiveTypes()
 	    mtypesfromdbconf.insert(*it);
     }
 
-    // Substract the types for missing helpers (the docs are indexed by name only):
+    // Substract the types for missing helpers (the docs are indexed
+    // by name only):
     string miss = theconfig->getMissingHelperDesc();
     if (!miss.empty()) {
-	FIMissingStore st;
-	FileInterner::getMissingFromDescription(&st, miss);
+	FIMissingStore st(miss);
 	map<string, set<string> >::const_iterator it;
 	for (it = st.m_typesForMissing.begin(); 
 	     it != st.m_typesForMissing.end(); it++) {