Hopefully fixed a deadlock that could occur during database transactions (see http://stackoverflow.com/questions/11535222/recommended-design-pattern-for-writing-to-sqlite-database-in-android)

api/src/com/todoroo/andlib/data/DatabaseDao.java

@@ -297,6 +297,7 @@ public class DatabaseDao<TYPE extends AbstractModel> {
         boolean recordOutstanding = shouldRecordOutstanding(item);
         final AtomicBoolean result = new AtomicBoolean(false);
 
+        synchronized(database) {
             if (recordOutstanding) { // begin transaction
                 database.getDatabase().beginTransactionWithListener(new SQLiteTransactionListener() {
                     @Override
@@ -325,6 +326,7 @@ public class DatabaseDao<TYPE extends AbstractModel> {
                 onModelUpdated(item, recordOutstanding && numOutstanding > 0);
                 item.markSaved();
             }
+        }
         return result.get();
     }