add createProject(), fix a couple things

DataStore.py

@@ -67,6 +67,20 @@ WHERE projectid = ?
         self.conn.commit()
         return tasks
 
+    def createProject(self, projectname):
+        c = self.conn.cursor()
+        projects = self.getProjects()
+        if projectname in projects.values():
+            return False
+        nextid = self.getNextId('projects')
+        c.execute('''
+INSERT INTO projects (id, name)
+VALUES (?, ?)
+''', (nextid, projectname))
+        c.close()
+        self.conn.commit()
+        return True
+
     def createTask(self, projectid, taskname):
         c = self.conn.cursor()
         tasks = self.getTasks(projectid)
@@ -75,7 +89,7 @@ WHERE projectid = ?
         nextid = self.getNextId('tasks')
         c.execute('''
 INSERT INTO tasks (id, projectid, name)
-VALUES (?, ?)
+VALUES (?, ?, ?)
 ''', (nextid, projectid, taskname))
         c.close()
         self.conn.commit()
@@ -89,6 +103,7 @@ SELECT MAX(id)
 FROM %s
 ''' % table)
         for row in c:
-            nextid = row[0] + 1
+            if row[0]:
+                nextid = row[0] + 1
         c.close()
         return nextid