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/Makefile

@@ -0,0 +1,20 @@
+# Note: use tabs
+# actions which are virtual, i.e. not a script
+.PHONY: install install-for-dev test 
+
+
+install:
+	pip install -e .
+
+
+# ---- Development ---
+
+test:
+	make install-for-dev
+	pytest
+
+install-for-dev:
+	pip install -r requirements/app.in -r requirements/dev.in -r requirements/test.in
+	make install
+	pre-commit install
+