0037428: don't use DalConnectionProvider default constructor

// 1. This version shouldn't be used, does the developer really want a flush or she forgot to use the 
parameterized constructor?
con = new DalConnectionProvider();
...

// 2. This version is better, we're more explicit about flushing
con = new DalConnectionProvider(true); // we need to flush because ...
...


// 3. This version is even better, don't delegate flushes to ConnectionProvider but to them explicitly

con = new DalConnectionProvider(false);
OBDal.getInstance().getSession().flush(); // we need to flush because ...
...