replace mss_settings

[Reimar Bauer]

Calling the mss UI with beforehand defining a mss_settings.py script added to PYTHONPATH is far to complicated for an easy going installation.

We should have a default configuration and offer a loader by the UI to add different config files.

The defaults should be storeable to a file the user could alter by his prefered editor.

Format of a config file may be yaml or json.

[Reimar Bauer]

implemented json config file for mss, example in docs, without configuration file, defaults in place, fixes #36

→ <<cset 658520a72cea>>

[Reimar Bauer]

Merged in ReimarBauer/mss (pull request #47)

implemented json config file for mss, example in docs, without configuration file, defaults in place, fixes #36

→ <<cset a6f11bc864ff>>

[Reimar Bauer]

fix bug related to switch to JSON configuration. See issue #36

→ <<cset 4ae82e33fd45>>