Add solar to DO.py

[alixunderplatz]

resolves #1716

• include fetched solar data for two large-scale PV plants
  • set solar from 'solar': None to hour.get(...) ... The two plants were already incuded in the "thermal" mapping. I hope this is how it should be done.
  • For the past, it seems that solar experienced similar issues as wind and hydro with data gaps (often for every 2nd hour)... maybe a similar processing as for wind and hydro should be used at some point to set solar to None instead of 0 when data is missing:

if isnan(solar):
            solar = None

... one of you Pros should to implement this ;)

Sample output for hour 8 of today:

Solar in source 0.72 MW and 1.43 MW:

Total solar output 2.15 MW:

{'zoneKey': 'DO', 'datetime': datetime.datetime(2018, 12, 26, 7, 0, tzinfo=tzfile('America/Virgin')), 'production': {'biomass': 29.66, 'coal': 306.78999999999996, 'gas': 791.6300000000001, 'hydro': 48.24, 'nuclear': 0.0, 'oil': 357.61, 'solar': 2.15, 'wind': 106.69, 'geothermal': 0.0, 'unknown': 0.0}, 'storage': {'hydro': None}, 'source': 'oc.org.do'}

---

Extra:

• add missing power plant "GENERACIÓN DE EMERGENCIA AES ANDRÉS" to mapping (auxiliary gas turbines commisioned on 1st December, see this source)

Before:
GENERACIÓN DE EMERGENCIA AES ANDRÉS is missing from the DO plant mapping!
[{'zoneKey': 'DO', 'datetime': datetime.datetime(2018, 12, 26, 0, 0, tzinfo=tzfile('America/Virgin')), 'production': {'biomass': 30.0, 'coal': 304.0, 'gas': 736.72, 'hydro': 200.75, 'nuclear': 0.0, 'oil': 505.92999999999995, 'solar': 0.0, 'wind': None, 'geothermal': 0.0, 'unknown': 112.0},

After:
[{'zoneKey': 'DO', 'datetime': datetime.datetime(2018, 12, 26, 0, 0, tzinfo=tzfile('America/Virgin')), 'production': {'biomass': 30.0, 'coal': 304.0, 'gas': 848.72, 'hydro': 200.75, 'nuclear': 0.0, 'oil': 505.92999999999995, 'solar': 0.0, 'wind': None, 'geothermal': 0.0, 'unknown': 0.0},

[corradio]

awesome!