Integrate TSAM

[henhuy]

I thought about integrating TSAM into data_adapter, but as processes are read sequentially from adapter this is not possible.
This is only possible once we have all sequences at hand - this would be in line

data_adapter_oemof/data_adapter_oemof/build_datapackage.py

Line 440 in ed1fc54

periods = cls.get_periods_from_parametrized_sequences(parametrized_sequences)

of data_adapter_oemof - at this place we could start a timeseries aggregation and store aggregated timeseries into sequences folder afterwards.
Additionally, we have to read in TSAM config (from JSON?) when building datapackage and store TSAM config into datapackage at some place as well - second step is addressed in oemof/oemof-tabular#138.

[nailend]

Check out the first draft for the tabular input format in folder dispatch_multi_period_tsam/data/tsam here.
The parameter occurences will be omitted, as discussed with @henhuy.
What do you think?