Fix theming by moving adhocracy_theming extend up

Order matters
Use adhocracy_theme by default instead of offenekommune_theme

This is more neutral.
Fix memcache parts +=
Pin repoze.what to 1.0.8, also in versions.cfg
Don't include theme package egg

Adding the theme package to the eggs section isn't necessary, but yields
the following error (note the wrong spelling):

MissingDistribution: Couldn't find a distribution for 'adhocracy.adhocracy-theme'.

@joka: Can you please check, why this was in at the first place?
adhocracy_with_theming shall not remove postgres parts
Add postgres port to postgres commands in buildout