I figured out the reason.
I had installed ZendStudio 8.0 in the directory /usr/local for experimental
things.
The ZendStudio runs fine, but since this time I got always mysterious
messages after closing vi. Vi could not find a python library.
So I deleted (rm -rf ...) all this stuff.
Now my vi works fine and I am able to start postgresql (as user postgres).
So for everybody, please check if you application installations are correct
and has no influence to your system.
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