get rid of psom_config

[pbellec]

psom_config was important for PSOM 1.0 which had to sacrifice some logging for performance. The psom_config was the only way to get sensible error messages if the configuration was not right. With PSOM 2.0, it should be possible to recover all important logs from the logs directory under normal operations. No need for psom_config anymore, which was a pain to maintain (and test) anyway.