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Besides the use of another module for option parsing, the main change is that
there's no more Config class that mixes configuration for different components.
Application classes now takes a simple 'dict' with parsed values.

The changes in 'neoctl' are somewhat ugly, because command-line options are not
defined on the command-line class, but this component is likely to disappear
in the future.

It remains possible to pass options via a configuration file. The code is a bit
complex but isolated in neo.lib.config

For SSL, the code may be simpler if we change for a single --ssl option that
takes 3 paths. Not done to not break compatibility. Hence, the hack with
an extra OptionList class in neo.lib.app

A new functional test tests the 'neomigrate' script, instead of just the
internal API to migrate data.