update configuration/option file

[steo85it]

The current format of the examples/MLA/options.py file should be updated to a centralised Config class, allowing for set_option functions to be called in the individual applications, test and examples (also printed out for documentation purposes).
(see python-flux/applications/config.py)
As of now, all routines in the code refer to a specific options file outside of the src dir.

[steo85it]

This should be solved now.