add DataStore.getTasks()

DataStore.py

@@ -52,3 +52,17 @@ FROM projects
         c.close()
         self.conn.commit()
         return projects
+
+    def getTasks(self, projectid):
+        c = self.conn.cursor()
+        c.execute('''
+SELECT id, name
+FROM tasks
+WHERE projectid = ?
+''' % (projectid,))
+        tasks = {}
+        for row in c:
+            tasks[row[0]] = row[1]
+        c.close()
+        self.conn.commit()
+        return tasks