First get rid of deprecation messages

• zope.app zcmlfiles deprecation

/home/tibi/zope3checkout/src/zope/configuration/config.py:690: DeprecationWarning: 
In configuration file: /home/tibi/zope3checkout/src/zope/app/zcmlfiles/configure.zcml 
replace: <include package="zope.app" /> with: <include package="zope.app.zcmlfiles" /> 
This will go away in Zope 3.6.

Solution: edit the site.zcml file and replace zope.app with zope.app.zcmfiles

Database migration

See if you need to migrate the database using the generations mechanism, by visiting /++etc++process/@@generations.html