[apps/graph][apps/sequence] In function store model, specify the

implementation of removeAll (always let an empty function in cartesian
functions)

Change-Id: I5e91a0ea427ba823eee4f86cdd8b7cd5426df2c6

apps/sequence/sequence_store.cpp

@@ -93,4 +93,11 @@ const KDColor SequenceStore::firstAvailableColor() {
   return k_defaultColors[0];
 }
 
+void SequenceStore::removeAll() {
+  for (int i = 0; i < m_numberOfFunctions; i++) {
+    m_sequences[i] = Sequence("", KDColorBlack);
+  }
+  m_numberOfFunctions = 0;
+}
+
 }