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-weather/flexmeasures_weather/utils/blueprinting.py

@@ -0,0 +1,22 @@
+import sys
+import importlib
+
+
+def ensure_bp_routes_are_loaded_fresh(module_name):
+    """
+    Reload a module if it has been loaded before.
+    It's useful for situations in which some other process has read
+    the module before, but you need some action to happen which only
+    happens during module import ― decorators are a good example.
+
+    One use case is pytest, which reads all python code when it collects tests.
+    In our case, that happens before FlexMeasures' import mechanism
+    has had a chance to know which blueprints a plugin has.
+    Seemingly, the importing code (plugin's __init__) can be imported later
+    than the imported module (containing @route decorators).
+    Re-importing helps to get this order right when FlexMeasures reads the
+    plugin's __init__.
+    """
+    m_name = "flexmeasures_weather." + module_name
+    if m_name in sys.modules:
+        importlib.reload(sys.modules[m_name])