Add FlexMeasures plugins, USEF protocol, and Cariflex simulator

- flexmeasures-entsoe: ENTSO-E data plugin
- flexmeasures-weather: Weather data plugin
- USEF Flex Trading Protocol PDF (2.4MB)
- Cariflex simulator (publishes to Redis)
- Dashboard Grafana updated with correct InfluxDB queries
- All tools extracted in /tools/

tools/flexmeasures-entsoe/setup.cfg

@@ -0,0 +1,10 @@
+[aliases]
+test = pytest
+flake8 = flake8
+
+[flake8]
+exclude = .git,__pycache__,documentation
+max-line-length = 160
+max-complexity = 13
+select = B,C,E,F,W,B9
+ignore = E501, W503, E203