Fix a bug on a query example for python
Fix a bug on a query example for python

Methods used by the former example,  `query.more()` and `query.next()`, do not exist any longer. 
I've modified  them to `query.execute()`, according to `BaseXClient.py`, to make it run as good as it should be.
joansmith/basex,JensErat/basex,JensErat/basex,joansmith/basex,vincentml/basex,deshmnnit04/basex,ksclarke/basex,vincentml/basex,drmacro/basex,BaseXdb/basex,drmacro/basex,vincentml/basex,deshmnnit04/basex,dimitarp/basex,joansmith/basex,ksclarke/basex,dimitarp/basex,JensErat/basex,JensErat/basex,dimitarp/basex,ksclarke/basex,deshmnnit04/basex,joansmith/basex,BaseXdb/basex,vincentml/basex,deshmnnit04/basex,dimitarp/basex,dimitarp/basex,drmacro/basex,BaseXdb/basex,BaseXdb/basex,joansmith/basex,dimitarp/basex,BaseXdb/basex,ksclarke/basex,vincentml/basex,JensErat/basex,ksclarke/basex,BaseXdb/basex,JensErat/basex,dimitarp/basex,deshmnnit04/basex,JensErat/basex,BaseXdb/basex,deshmnnit04/basex,vincentml/basex,vincentml/basex,drmacro/basex,dimitarp/basex,joansmith/basex,deshmnnit04/basex,vincentml/basex,ksclarke/basex,joansmith/basex,deshmnnit04/basex,vincentml/basex,JensErat/basex,drmacro/basex,dimitarp/basex,drmacro/basex,BaseXdb/basex,dimitarp/basex,joansmith/basex,drmacro/basex,ksclarke/basex,joansmith/basex,joansmith/basex,dimitarp/basex,joansmith/basex,drmacro/basex,JensErat/basex,vincentml/basex,deshmnnit04/basex,BaseXdb/basex,vincentml/basex,ksclarke/basex,dimitarp/basex,BaseXdb/basex,BaseXdb/basex,joansmith/basex,ksclarke/basex,ksclarke/basex,deshmnnit04/basex,ksclarke/basex,drmacro/basex,BaseXdb/basex,vincentml/basex,deshmnnit04/basex,drmacro/basex,drmacro/basex,ksclarke/basex,JensErat/basex,JensErat/basex,deshmnnit04/basex,drmacro/basex,JensErat/basex